DRM tuned C5 thats sick!
Thread Starter
Melting Slicks
Joined: Jul 2005
Posts: 2,586
Likes: 2
From: Bardstown Kentucky
DRM tuned C5 thats sick!
So I have a 98 DRM C5RS, supposed to be one of the better tuners but my results aren't showing this. Not to bash DRM but with the money I have in this car it should perform a lot better than it does. I see people with heads and a cam putting down 400RWHP all the time. I have 2.02 valve heads, custom grind cam, long tube headers, donaldson blackwing, B&B exhaust, and a Z06 intake. I put down 356RWHP. I am running stock injectors and heard this could be the problem. Does anyone have a solution to my 400 horse woes?
Burning Brakes
Joined: Dec 2003
Posts: 1,074
Likes: 0
From: Dallas (Go Cowboys!!!) :) Tx
Originally Posted by 95BlueBomber
So I have a 98 DRM C5RS, supposed to be one of the better tuners but my results aren't showing this. Not to bash DRM but with the money I have in this car it should perform a lot better than it does. I see people with heads and a cam putting down 400RWHP all the time. I have 2.02 valve heads, custom grind cam, long tube headers, donaldson blackwing, B&B exhaust, and a Z06 intake. I put down 356RWHP. I am running stock injectors and heard this could be the problem. Does anyone have a solution to my 400 horse woes?
Burning Brakes
Joined: Feb 2002
Posts: 1,154
Likes: 25
From: Jasper GA
I have to agree; your numbers are way off. I've seen head/cam/bolt-on C5s make 500 RWHP, and there have been a plethora of them over 450. You need a knowledgable shop to do a diagnosis of all the mechanical and electrical bits that can cause an engine to underperform.
Burning Brakes
Joined: Sep 2004
Posts: 1,056
Likes: 0
From: Havelock, NC ( NJ Resident )
Want To Have 400rwhp
What gears are in the rear and what Tranny are you running? Also who did your tune? Because I agree with what you have you should be laying down atleast 400. retune the auto
Le Mans Master
Joined: Aug 2000
Posts: 5,294
Likes: 2
From: Suffolk, Long Island NY
Yes the gear ratio can affect dyno numbers, but not a large amount though, depending on what ratio you go with.
What grind on the cam?
Do you have a high stall converter?
If it's a small cam, your numbers may not be off by much.
What grind on the cam?
Do you have a high stall converter?
If it's a small cam, your numbers may not be off by much.
Burning Brakes
Joined: Nov 1999
Posts: 901
Likes: 83
From: Los Angeles
What is a 2.02 head exactly ? What are the cam specs ? Who assembled it ? Is the cam degreed ? How thick are the head gaskets ? Which headers ? How much timing....?
Alot of missing details come into play. Having an auto will always hurt.
Alot of missing details come into play. Having an auto will always hurt.
Team Owner
Joined: Oct 1999
Posts: 31,977
Likes: 487
From: Guinness Its whats for B'fast JAWGA
CI 3-4-5-9 Veteran
Originally Posted by JR_VET
What gears are in the rear and what Tranny are you running? Also who did your tune? Because I agree with what you have you should be laying down atleast 400. retune the auto
when the first 400rwhp H&C came out so if the H&C is an old design it may not have the power.
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Burning Brakes
Joined: Sep 2004
Posts: 1,056
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From: Havelock, NC ( NJ Resident )
Originally Posted by 93Polo
With an A4 it is not a given. Many called when the first 400rwhp H&C came out so if the H&C is an old design it may not have the power.
when the first 400rwhp H&C came out so if the H&C is an old design it may not have the power.
Safety Car
Joined: Oct 2000
Posts: 4,949
Likes: 10
From: Monticello MN
Originally Posted by JR_VET
see there are so many question and you haven't provided any answer.
BTW, stock injectors for a 1998 were 28.8 lbs., way more than enough for well over 400 rear-wheel horsepower. What did you spec the car out to? What did you ask to have installed? A cam is not just a cam, heads are not just heads and headers are not just headers. In other words they're not all the same. What you end up with is the result of a combination of the parts you have installed. Talk to Doug, Randy or Tim. They are all great guys who will gladly work with you. Rippie Motorsports is top-notch. I know from experience. 
Ed
Burning Brakes
Joined: Sep 2004
Posts: 1,056
Likes: 0
From: Havelock, NC ( NJ Resident )
Originally Posted by C5XTASY
BTW, stock injectors for a 1998 were 28.8 lbs., way more than enough for well over 400 rear-wheel horsepower. What did you spec the car out to? What did you ask to have installed? A cam is not just a cam, heads are not just heads and headers are not just headers. In other words they're not all the same. What you end up with is the result of a combination of the parts you have installed. Talk to Doug, Randy or Tim. They are all great guys who will gladly work with you. Rippie Motorsports is top-notch. I know from experience. Ed
Talk to some guys who have been there and give then your specs. and see what they say.
Pro
Joined: Aug 2004
Posts: 575
Likes: 0
From: Richmond Hill Ontario
In the same boat.
I'm having the same issue. With LS6 ported heads, 2.02 valves, LT headers, hi-flow cats, X-pipe, Z06 rear exhaust, Comp Cams 212/218 (I know it's a small cam but there's a story behind it) I made 336rwhp before tuning and 348rwhp after tuning. My car is a 2001 so it has the LS6 intake on it already and I used a Z06 airbox. I'm also being told it's the tune and am waiting to go back again. At the track the car went 113mph on the stock runflats (2.2 60') with a best ET of 12.88. Funny thing is all the HP calculators say that 113mph = 385rwhp (447hp at the flywheel) so I'm not sure if dyno numbers can be believed. Dyno's are good for tuning (somewhat) but being able to log live data while driving is the best way to get your car tuned properly. The shop I went to tuned my car in an hour but I don't think that's enough time. After the tune I believe you should drive the car for a while to allow the PCM to go through a relearn and then go back and look at the data again. This will give you a chance to make more finite adjustments and should get you better performance. I know guys say that experienced tuners can get it right in an hour or so but I'd still want to go back and see if things have changed from the original tune. That should be included in the tuning.
Safety Car
Joined: Oct 2000
Posts: 4,949
Likes: 10
From: Monticello MN
Originally Posted by vetpet
I have an MN6 with the stock 3.42 gears.
I suspect that you are not putting down the 385 rwhp you think you are, and the dyno number is about right. Stock 2002-2004 Z06s get 345-350 rwhp and they run in the low 12s. I realize they are geared a little lower, but not half-a-second worth. Getting your tune re-checked should be interesting. Good luck!
Ed
Safety Car
Joined: Oct 2000
Posts: 4,949
Likes: 10
From: Monticello MN
Very strange. The initiator does not reply back with any answers, even though he's made other posts, to other threads in the Forum, since he's posted to this thread. He has not contacted Rippie Motorsports. Don't quite understand his reasoning behind starting this thread if he doesn't plan on providing any feedback. 
Ed
Ed
Last edited by C5XTASY; Oct 7, 2005 at 02:15 PM.
Race Director
Joined: Mar 2004
Posts: 12,634
Likes: 15
From: IL, Chicago area.
St. Jude Donor '14-'15-'16
My car has the bigger intake and exhaust valves as well and is a MN6 vs your A4 but my numbers are closer to what you should be. Which intake are you using, if its still the LS1 there is part of your problem.