Author Topic: Down pipe results (Read 8836 times)

snaponbob · « **on:** February 03, 2009, 06:37:07 PM »

I finished the installation of a Solo Performance catless downpipe. I don't have an after market tune on board yet. Running through a MagnaFlow 3" catback system, it is certainly a bit louder, but not much different than with the cat through the Solo 3" single Racepipe. The "nanny" has not completely taken hold of the new mod yet, so the DP is still showing its value as a performance mod.

The turbo really does spool up quicker. There is a bit more pressure on my seat back. Looking at the DIC it is clear that it is hitting a higher boost level (especially given the cold weather - mid 20s) before it pulls back a bit. It sure feels like there is a bit more oomph above 4000 rpm and does not seem to fall off as much above 5500 rpm. Can't wait for the I/C and Wester's tune !!!!!!!!!!!!!!!!

Sly Bob · « **Reply #1 on:** February 03, 2009, 07:03:45 PM »

Yeah that is my concern about getting a new exhaust system this spring. I have already given a deposit and I am REALLY looking forward to getting the Solo GXP-RCD with the high flow cat but I don't like the idea that the computer will pull any performance enhancements back after a few tanks of gas.

A tune of some description is DEFINITELY in my future.

snaponbob · « **Reply #2 on:** February 03, 2009, 07:35:28 PM »

It won't take a few tanks of gas for the "nanny" to strangle the mods. More like 3-5 drive cycles. If you are getting a high flow cat by all means you will need a "silenced" exhaust. Just for sh!ts and grins I plan on swapping over to the straight 3" Solo RacePipe just to see how bad (er, noisy) it really is. Unless Lyndon uncorks a Genie from the GMPP tune I will pass on the GMPP tune and use Lyndon's own tune for my car.

Sly Bob · « **Reply #3 on:** February 03, 2009, 08:10:37 PM »

3 to 5 drive cycles? Now I'm REALLY bummed!

Deep-GXP · « **Reply #4 on:** February 03, 2009, 08:41:37 PM »

Quote from: snaponbob on February 03, 2009, 07:35:28 PM

Unless Lyndon uncorks a Genie from the GMPP tune I will pass on the GMPP tune and use Lyndon's own tune for my car.

Cant you just buy Westers current tune right now and then later when Lyndon comes out with a tune for the GMPP tune you can buy the GMPP kit (from wherever you choose) and recieve a GMPP tune update for free from lyndon?

snaponbob · « **Reply #5 on:** February 03, 2009, 11:09:46 PM »

Quote from: Deep-GXP on February 03, 2009, 08:41:37 PM

Cant you just buy Westers current tune right now and then later when Lyndon comes out with a tune for the GMPP tune you can buy the GMPP kit (from wherever you choose) and recieve a GMPP tune update for free from lyndon?

No idea how he is going to handle that issue. I am going to get the Wester's tune as soon as my HP Tune package arrives.

snaponbob · « **Reply #6 on:** February 03, 2009, 11:11:59 PM »

And here is no surprise ------------ 3rd cycle and the engine threw a P0420 catalytic converter efficiency code. Runs fine, so the Wester tune will be configured to shut that off.

lil goat · « **Reply #7 on:** February 04, 2009, 01:48:19 AM »

Lyndon runs the downpipe with the Solo Street Race, he told me sometime back he saw 31 hp on the dyno just from the downpipe. Told me to ditch my cat, I have been thinking about it.

Cant you just buy Westers current tune right now and then later when Lyndon comes out with a tune for the GMPP tune you can buy the GMPP kit (from wherever you choose) and recieve a GMPP tune update for free from lyndon?

Yes you sure can.

Frank I · « **Reply #8 on:** February 06, 2009, 10:54:45 AM »

Quote from: lil goat on February 04, 2009, 01:48:19 AM

Lyndon runs the downpipe with the Solo Street Race, he told me sometime back he saw 31 hp on the dyno just from the downpipe. Told me to ditch my cat, I have been thinking about it.

Goat:
1. Was Lyndon's HP gain a spike reading or pretty much through a wide RPM range?
2. Was his car stock with just the downpipe or what mods did he have?
3. Was that 31HP over the stock GM Converter? If so, I wonder how much gain the downpipe would give over the Solo High Flow CAT?

Just thought I would ask. Take care and have a great day.

Frank I

snaponbob · « **Reply #9 on:** February 06, 2009, 01:32:41 PM »

Quote from: lil goat on February 04, 2009, 01:48:19 AM

Lyndon runs the downpipe with the Solo Street Race, he told me sometime back he saw 31 hp on the dyno just from the downpipe. Told me to ditch my cat, I have been thinking about it.

I would have to assume that the 31HP was with a tune as the nanny would have its way with the output. But I am still amazed at the changes that have stayed in place with the downpipe and stock tune. I sure wish there was more room for wider wheels and tires without hitting the sheet metal. The 245 Goodyears will not be up to the task of containing the power that will be coming to them. Hell, it's almost hopeless NOW with just a downpipe and MagnaFlow.

lil goat · « **Reply #10 on:** February 07, 2009, 03:36:30 PM »

Quote from: Frank I on February 06, 2009, 10:54:45 AM

Goat:
1. Was Lyndon's HP gain a spike reading or pretty much through a wide RPM range?
2. Was his car stock with just the downpipe or what mods did he have?
3. Was that 31HP over the stock GM Converter? If so, I wonder how much gain the downpipe would give over the Solo High Flow CAT?

Just thought I would ask. Take care and have a great day.

Frank I

He did the down pipe test a long time ago, this was against the stock cat, it was before Solo had the hi-flow cat out, it was with one of his early tunes. before he cracked the boost controller so about 18 psi boost. I imagine it would be a bit less now but still significant. Gains are never cumulative. I will try and explain, these are hypothetical numbers. OK say the down pipe add 25 hp, and the intercooler, adds 25 hp and the tune adds 50 hp, if you install all three you might end up with a 75 hp gain if you are lucky, not 100, more likely 65 hp gain from all three together. That is just the way mods work, by doing all three you will likely have a smoother torque curve and cooler operating temps, more hp is not the only gain from many mods.

I imagine the 31 hp gain was a peak number most likely about 5000 rpm. I never saw the dyno sheet. If I was racing I would absolutely pull the cat, and have Lyndon do a tune for it, it is illegal in all 50 states to drive a late model vehicle on the street without a cat, but how often do they check, and do you feel comfortable doing it. In VA. they check once a year.

Go-N Def · « **Reply #11 on:** February 07, 2009, 03:40:13 PM »

If your talking about the emmisions test, that's only in Northern VA...

lil goat · « **Reply #12 on:** February 07, 2009, 03:47:53 PM »

You are correct, I forgot about that, but there is a bill to change it to the entire state floating around. Anyway for me it's once a year, lot's of places it is only when the car is sold, the new buyer has to get it checked. Some states never check, but they are still required.

Go-N Def · « **Reply #13 on:** February 07, 2009, 03:54:09 PM »

You just need to drive south for an hour or so. They don't go by where yur car is registered, only by where you get the inspection done. I go to the guy that my dad uses (he also rents his house from the guy). He looks at the car and goes, "She sure is clean, hit the horn for me." If the horn works, I get the sticker! LOL!

I'll stop thread-jacking now......

Deep-GXP · « **Reply #14 on:** February 07, 2009, 04:48:31 PM »

Does it bolt up to the stock GXP Exhaust? How much louder would it make the stock gxp exhaust sound? When compared to say Solo Street/Mach systems?
How hard is it to install? Any special tools needed? Thanks.

-Carlos

Frank I · « **Reply #15 on:** February 12, 2009, 01:03:05 AM »

Quote from: lil goat on February 07, 2009, 03:36:30 PM

He did the down pipe test a long time ago, this was against the stock cat, it was before Solo had the hi-flow cat out, it was with one of his early tunes. before he cracked the boost controller so about 18 psi boost. I imagine it would be a bit less now but still significant. Gains are never cumulative. I will try and explain, these are hypothetical numbers. OK say the down pipe add 25 hp, and the intercooler, adds 25 hp and the tune adds 50 hp, if you install all three you might end up with a 75 hp gain if you are lucky, not 100, more likely 65 hp gain from all three together. That is just the way mods work, by doing all three you will likely have a smoother torque curve and cooler operating temps, more hp is not the only gain from many mods.

Goat:

Well aware mods are not cumulative. However, freeing up back pressure on a Turbo engine is highly desirable and I was wondering how much back pressure was being relieved verses the stock CAT or Jeff's High Flow CAT. The difference in HP and Torque would be interesting to know in addition to where in the RPM range the difference was most significant?

As always, thanks for your response and have a great day.

Frank I

snaponbob · « **Reply #16 on:** February 12, 2009, 09:20:30 AM »

Quote from: Frank I on February 12, 2009, 01:03:05 AM

Goat:

Well aware mods are not cumulative. However, freeing up back pressure on a Turbo engine is highly desirable and I was wondering how much back pressure was being relieved verses the stock CAT or Jeff's High Flow CAT. The difference in HP and Torque would be interesting to know in addition to where in the RPM range the difference was most significant?

As always, thanks for your response and have a great day.

Frank I

The only way to determine before/after back pressure levels would simply be the use of a back pressure test set (an adapter to the upstream O2 sensor bung and a 20-30 psi gauge) on a cat and then whatever goes in its place. I didn't do it (even though I actaully have a set !!) as I was not really curious. But in hind sight had it been mentioned I would have done it although if it wasn't done on a dyno the results would have been somewhat skewed. Anyway, the butt dyno and DIC say that a substantial change occurred. Above 2000 rpm the spool up is nearly instant and at much lower pedal modulation. After a few drive cycles the nanny learned down what it could, but clearly there is more torque away from the rpm torque peak as I assume that the nanny is looking for key points of its internal map that say 260 lb/ft is being produced with less regard for what rpm it is happening at. Still falls off above 5500 rpm and will so even with tunes but such is life with a little turbo with a little inlet.

There was a question on how much louder the stock exhaust would be with a down pipe. Based on how my MF system sounds, it would probably be a bit louder than a stock car with an MF, but not too much. And the MF with stock cat is not noisy at all. I would suggest that if one put a downpipe on their car and didn't like it that there would be a ready market for a lightly used dp.

DeepBlueGXP · « **Reply #17 on:** February 12, 2009, 09:36:41 AM »

Snapbob, a proper tune, like the one from Westers doesn't drop off at 5500 rpm. I need to get a new dyno that the operator will goto my redline but here is one he stopped at 5700 and my torque was dropping a tiny bit but the HP was still up there. Keep in mind that this needs a percentage added to it to equal a dynojet

snaponbob · « **Reply #18 on:** February 12, 2009, 10:24:38 AM »

Lyndon may be e-mailing a tune to me today.

And after I do some

the car goes on jack stands again for poly bushings from Dejon's.

GXPinKC · « **Reply #19 on:** February 12, 2009, 11:03:35 AM »

Quote from: snaponbob on February 12, 2009, 10:24:38 AM

Lyndon may be e-mailing a tune to me today. And after I do some the car goes on jack stands again for poly bushings from Dejon's.

Congrats snaponbob! Can tell you are excited. Hope you get the tune from Lyndon today. If so, will be on the edge of my seat waiting for your first post on this great forum. Enjoy your transformed 2007 Redline.
Sincerely,
GXPinKC
Ron

snaponbob · « **Reply #20 on:** February 12, 2009, 11:51:59 AM »

First, I have to wait for HP Tuners to answer e-mails about bugs that won't allow the file to open and run. Their forums show this as an "issue". Fun. Off to the gym.

Frank I · « **Reply #21 on:** February 13, 2009, 12:17:50 PM »

Quote from: snaponbob on February 12, 2009, 10:24:38 AM

Lyndon may be e-mailing a tune to me today. And after I do some the car goes on jack stands again for poly bushings from Dejon's.

Snaponbob:
You will be very impressed with Lyndon's Tune. It makes the car totally different in power available and transition of power. Just one word of advise, keep an eye on Spark Retard if you have the capability to read it with a Dashhawk or some other devise. Also, if you have not changed to T-Bolt clamps on your Throttle Body, change it even if your current stock clamp appears to be holding boost. As Lyndon will advise, if you changed the wastegate rod adjustment, put it back to the stock position, you will not need it and the engine will run smoother in transition.
Wish we could all share the new found fun with you, if your like me, you will have a smile on your face for several days. Have fun!!!!!
Frank I

DeepBlueGXP · « **Reply #22 on:** February 13, 2009, 12:20:51 PM »

Great advice, changed my clamps as the one on the drivers side intake kept coming loose.

snaponbob · « **Reply #23 on:** February 13, 2009, 12:35:44 PM »

Quote from: Frank I on February 13, 2009, 12:17:50 PM

Snaponbob:
You will be very impressed with Lyndon's Tune. It makes the car totally different in power available and transition of power. Just one word of advise, keep an eye on Spark Retard if you have the capability to read it with a Dashhawk or some other devise. Also, if you have not changed to T-Bolt clamps on your Throttle Body, change it even if your current stock clamp appears to be holding boost. As Lyndon will advise, if you changed the wastegate rod adjustment, put it back to the stock position, you will not need it and the engine will run smoother in transition.
Wish we could all share the new found fun with you, if your like me, you will have a smile on your face for several days. Have fun!!!!!
Frank I

I have NOT done the t-bolt clamps. Where does one get them?

As for the first results of the tune, I was asked (or it was suggested) that I start a seperate thread, and I did so. http://kappaperformance.com/forum/index.php?topic=839.msg9508;topicseen#new

Deep-GXP · « **Reply #24 on:** February 13, 2009, 06:39:45 PM »

Quote from: snaponbob on February 13, 2009, 12:35:44 PM

I have NOT done the t-bolt clamps. Where does one get them?

Here: http://www.verociousmotorsports.com/Shop-by-Category/T-Bolt-Clamps/Stainless-Steel-Flat-Band-T-Bolt-Clamp

or you SHOULD be able to get them at a local Hydraulic/Industrial Hose - Couplings - Adaptor store.

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Author Topic: Down pipe results (Read 8836 times)

lil goat

lil goat

lil goat