My 99 C2 VF supercharged dyno #'s are in
#1
10-01-2009, 08:23 PM
Join Date: Aug 2009
Location: De Pere, Wisconsin
Posts: 119
Rep Power: 20 
My 99 C2 VF supercharged dyno #'s are in
I have a 99 C2 with a VF supercharger kit on it running supposively 6lbs of boost.
So.....I must say I'm a TAD disappointed with the #'s the car put down. I was really expecting 370-380rwhp on a dynojet but the car ended up making 333rwhp(SAE corrected) I also was unable to get ANY kind of boost reading on the dyno(so I'm not sure if its getting 6lbs or not) when we tapped the line into the blow off bypass valve line....which is weird to me considering the car did show vacuum. My car also has fabspeed headers and high flow cats on it.
The kit was installed in 2004, I'm not sure if maybe I need a recent ECU upgrade from VF? I've read some of these other guys on here making almost near 400rwhp...seems a little extreme for me but maybe that's what my car should be making?
I'm going to put in some new iridium plugs that are 1 step colder than factory due to the supercharger, and new spark plug boots as my boots on the coils are severely cracked(but its not causing the engine to miss as of yet)
Anything else you guys can think of?
So.....I must say I'm a TAD disappointed with the #'s the car put down. I was really expecting 370-380rwhp on a dynojet but the car ended up making 333rwhp(SAE corrected) I also was unable to get ANY kind of boost reading on the dyno(so I'm not sure if its getting 6lbs or not) when we tapped the line into the blow off bypass valve line....which is weird to me considering the car did show vacuum. My car also has fabspeed headers and high flow cats on it.
The kit was installed in 2004, I'm not sure if maybe I need a recent ECU upgrade from VF? I've read some of these other guys on here making almost near 400rwhp...seems a little extreme for me but maybe that's what my car should be making?
I'm going to put in some new iridium plugs that are 1 step colder than factory due to the supercharger, and new spark plug boots as my boots on the coils are severely cracked(but its not causing the engine to miss as of yet)
Anything else you guys can think of?
Last edited by brandongt3; 10-01-2009 at 08:45 PM.
#2
10-01-2009, 08:47 PM
I have a 99 C2 with a VF supercharger kit on it running 6lbs of boost.
So.....I must say I'm a TAD disappointed with the #'s the car put down. I was really expecting 370-380rwhp on a dynojet but the car ended up making 333rwhp(SAE corrected) I also was unable to get ANY kind of boost reading on the dyno when we tapped the line into the blow off bypass valve line....which is weird to me. My car also has fabspeed headers and high flow cats on it.
My tuner didnt even know if the supercharger was working due to being unable to get a boost reading, but it must be if the car is making 333rwhp? I know these cars wouldnt make anything near that without the supercharger.
The kit was installed in 2004, I'm not sure if maybe I need a recent ECU upgrade from VF? I've read some of these other guys on here making almost near 400rwhp...seems a little extreme for me but maybe that's what my car should be making?
I'm going to put in some new iridium plugs that are 1 step colder than factory due to the supercharger, and new spark plug boots as my boots on the coils are severely cracked(but its not causing the engine to miss as of yet)
Anything else you guys can think of?
So.....I must say I'm a TAD disappointed with the #'s the car put down. I was really expecting 370-380rwhp on a dynojet but the car ended up making 333rwhp(SAE corrected) I also was unable to get ANY kind of boost reading on the dyno when we tapped the line into the blow off bypass valve line....which is weird to me. My car also has fabspeed headers and high flow cats on it.
My tuner didnt even know if the supercharger was working due to being unable to get a boost reading, but it must be if the car is making 333rwhp? I know these cars wouldnt make anything near that without the supercharger.
The kit was installed in 2004, I'm not sure if maybe I need a recent ECU upgrade from VF? I've read some of these other guys on here making almost near 400rwhp...seems a little extreme for me but maybe that's what my car should be making?
I'm going to put in some new iridium plugs that are 1 step colder than factory due to the supercharger, and new spark plug boots as my boots on the coils are severely cracked(but its not causing the engine to miss as of yet)
Anything else you guys can think of?
What is the claimed HP stock of your car?
My dyno's have been disappointing here too!
It is amazing how the dyno's vary SOOO much and the only true way is to do before and after dyno runs same dyno same conditions.And I am sure even then there will be variances!
I have tried all 3 dynos......2-Mustangs,Dynapack and a Dynojet.
With 5.9 psi and depending what dyno.....I am making anywhere from 360-390 RWHP and I too was expecting more!
I have been doing a ton of reading and making 10-15 RWHP/PSI of boost isn't so uncommon(this is not based from a Porsche site)!
So I am wondering,like you,how in the h$#ll are people posting these HUGE #'s...?
I also came home that night from the dyno's and changed my plugs,LOL!!!
My BEST measurement for years HAS been my G-tech for measuring this stuff so after the dyno's I put it in a ripped around.....and it shows 366RWHP.
So my advice is forget about the dyno's and go and get a G-tech and find yourself a flat road somewhere and BASE all of your mods form it!
Stacy
Last edited by justatoy; 10-01-2009 at 08:55 PM.
#3
10-01-2009, 08:56 PM
Join Date: Aug 2009
Location: De Pere, Wisconsin
Posts: 119
Rep Power: 20 What is the claimed HP stock of your car?
My dyno's have been disappointing here too!
It is amazing how the dyno's vary SOOO much and the only true way is to do before and after dyno runs same dyno same conditions.And I am sure even then there will be variances!
With 5.9 psi and depending what dyno.....I am making anywhere from 360-390 RWHP and I too was expecting more!
I have been doing a ton of reading and making 10-15 RWHP/PSI of boost isn't so uncommon(this is not based from a Porsche site)!
So I am wondering,like you,how in the h$#ll are people posting these HUGE #'s...?
I also came home that night from the dyno's and changed my plugs,LOL!!!
My BEST measurement for years HAS been my G-tech for measuring this stuff so after the dyno's I put it in a ripped around.....and it shows 366RWHP.
So my advice is forget about the dyno's and go and get a G-tech and find yourself a flat road somewhere and BASE all of your mods form it!
Stacy
My dyno's have been disappointing here too!
It is amazing how the dyno's vary SOOO much and the only true way is to do before and after dyno runs same dyno same conditions.And I am sure even then there will be variances!
With 5.9 psi and depending what dyno.....I am making anywhere from 360-390 RWHP and I too was expecting more!
I have been doing a ton of reading and making 10-15 RWHP/PSI of boost isn't so uncommon(this is not based from a Porsche site)!
So I am wondering,like you,how in the h$#ll are people posting these HUGE #'s...?
I also came home that night from the dyno's and changed my plugs,LOL!!!
My BEST measurement for years HAS been my G-tech for measuring this stuff so after the dyno's I put it in a ripped around.....and it shows 366RWHP.
So my advice is forget about the dyno's and go and get a G-tech and find yourself a flat road somewhere and BASE all of your mods form it!
Stacy
To me, if I disregarded what other people were saying they're making for power, 333rwhp seems alright due to the car probably puts down around 250rwhp from the factory, which would be a 83rwhp gain over factory. But if some of these people are making 400+rwhp, something is obviously wrong with my set up then considering im almost 80rwhp lower than that!
#4
10-01-2009, 09:02 PM
Yeah who knows...I sure hope these people posting #'s of 400rwhp and above are actually getting them from a REAL DYNO instead of something like a GTECH lol.....That would explain it...
To me, if I disregarded what other people were saying they're making for power, 333rwhp seems alright due to the car probably puts down around 250rwhp from the factory, which would be a 83rwhp gain over factory. But if some of these people are making 400+rwhp, something is obviously wrong with my set up then considering im almost 80rwhp lower than that!
To me, if I disregarded what other people were saying they're making for power, 333rwhp seems alright due to the car probably puts down around 250rwhp from the factory, which would be a 83rwhp gain over factory. But if some of these people are making 400+rwhp, something is obviously wrong with my set up then considering im almost 80rwhp lower than that!
I have done probably 20 pulls last week and they were all within' a few hp except for one......and boy did I like that #...but ruled it out!
I have used it for years but thought for a change I will go to a dyno for some paper work.....
#6
10-02-2009, 05:40 AM
Registered User
Join Date: Aug 2004
Location: Chicagoland
Posts: 2,134
Rep Power: 122 
You're numbers are not that far off from what they should be for a 99 C2. The stock SC setup delivers close to 360 rwhp and 280 rwt. As Stacy mentioned, dynos vary greatly. It is common to find 10%+ difference in dyno results for various reasons, such as climate conditions, operator error and/or car condition.
I would suggest that your SC is running as designed, so enjoy it.
Most, if not all of these claims of rwhp at 450+ are nothing more than exaggerations.
I would suggest that your SC is running as designed, so enjoy it.
Most, if not all of these claims of rwhp at 450+ are nothing more than exaggerations.
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#11
10-02-2009, 08:55 AM
Join Date: Aug 2009
Location: De Pere, Wisconsin
Posts: 119
Rep Power: 20
No I havn't....is there a need to if the check engine light isnt on?
#12
10-02-2009, 08:58 AM
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Join Date: Aug 2004
Location: Chicagoland
Posts: 2,134
Rep Power: 122 Unless you have data logged your timing, air flow and a/f ratio while dynoing, you have wasted your time if you're looking to diagnose a possible problem. Any dyno shop that does not do this automatically for you, is even more of a waste than those who do.
#13
10-02-2009, 09:01 AM
My thoughts as well. Post up your dyno sheet... i am sure we could give you somewhere to look.
Casey
#14
10-02-2009, 09:05 AM
Join Date: Aug 2009
Location: De Pere, Wisconsin
Posts: 119
Rep Power: 20 This shop, Beyond Redline, is very very good, they tuned my supra which put down 1140rwhp, I know my porsche is in good hands. However I sure would like to find out why we cant get a boost reading?? Air fuels were at a very rich 10's on idle but went to 11.2-11.4 WOT....
#15
10-02-2009, 09:14 AM
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Join Date: Aug 2004
Location: Chicagoland
Posts: 2,134
Rep Power: 122 well thats the problem considering the dyno couldnt monitor boost at all.....we tapped into the vacuum line for the blow off valve and there was nothing coming up showing boost. So thats the first problem.
This shop, Beyond Redline, is very very good, they tuned my supra which put down 1140rwhp, I know my porsche is in good hands. However I sure would like to find out why we cant get a boost reading?? Air fuels were at a very rich 10's on idle but went to 11.2-11.4 WOT....
This shop, Beyond Redline, is very very good, they tuned my supra which put down 1140rwhp, I know my porsche is in good hands. However I sure would like to find out why we cant get a boost reading?? Air fuels were at a very rich 10's on idle but went to 11.2-11.4 WOT....
You would have vacuum and not boost at idle. If you have no vacuum at that location, I suspect you connected the gauge wrong or the gauge is not working. Even if you had no SC on your car, your would record boost from the intake at WOT at certain locations in the power curve.
Your rich a/f ratio at redline would decrease power. You were probably backfiring out your exhaust with that rich of a mixture.
I would go back and have them do it right, for free since they obviously did not know what they were doing.