had the car dynoed the other day for fun and it came up with some unacceptable numbers........

on the engine alone they told me 223 hp with little under 300 torque on 2 runs.

the final run i had them use the N2O and a supposed 75 shot only uped the numbers 2 more hp and about 10 for torque.

now the last time at the track the car ran mid to high 13's on engine and low 13's on N2O unadjusted and heavily rich....not to mention all runs were 2.0 60's spinning on street tires.

they tried to tell me that the computer doesn't lie........my biggest problem is trying to believe you can hit a trap speed of 110 with 225 hp.........now they didn't let the car warm up, but i don't know what they could have had to do with it.....anyone have a solution to this please let me know.

here's a pic for fun!!

 

your Dyno runs are rear wheel numbers (RWHP & RWTQ) or are you thinking they are at the flywheel. Also your car will test better cold.

 

Still way too low for that trap speed.

 

Did they have any sensors hooked to the car to tell you if it was running rich or lean during the runs?

And was that number (223) what they measured at the wheels? Did they give you a print out of the 3 runs?

nick

 

How about the tranny/torque converter having problems? Slippage? Especially with a nitrous shot....something could be going bad.

 

I would go to another dyno, those numbers just don't seem right for what your running, And from the pic it looks like they tow the dyno around. So I would go to another place to get a rerun. Especailly if your car doesn't feel like there's a prob. That's what I would do anyway.

 

tranny was rebuilt 15,000 miles ago with maybe 3 bottles through it. could be going bad, but it doesn't act up at the track or on the road!

yes those numbers are suppose to be at the wheel........i'm not upset with the numbers except that it doesn't explain the trap speed??

lets put it this way, pretty much everything on the car is in good working shape, rolling at 20-25 mph i break the brand new tires loose without a problem.....up to 35 i can do it with the little shot of N2O.

point being that everything seems to be working good and the time slips seem to show it. yet the dyno didn't.......now it was my first time using the dyno so i didn't know what to expect, but i certainly didn't expect a 2 hp gain with n2o.

 

Your numbers NA are not bad at all and you can get mid 13's with those numbers, I think that the problem was/is in the N20. Was the bottle almost empty, cold, or did they not know how to work it correctly? If on the street it is a noticeable difference I would belive it was user error or maybe your bottle was low. My friend with a lightly modded 91 350 dynoed the same NA and with a 125 shot got 300rwhp.

Chris

 

I'd also bet on a nitrous problem, user error, blown fuse, low or empty bottle, maybe just forgetting to open the bottle valve (that's embarassing, especially at the track, don't ask how I know). Especially considering your 1/4 mile times are right where they should be with a 75 N2O shot. DD2000 says a little over 300 hp with that level nitrous shot on a stock l98. At the flywheel of course, RWHP will be about 20-30% lower.

 

like i said i know it's basically a ball park figure.......but it just seemed so low on the N2O.

definately a waste of 65 bucks.....

i know that it's working because i took it out the very same morning and had no problem on the street.........funny thing was you could hear it kick in on the dyno so something engaged........just wasn't read. damn werx people....

i asked them to do one more run because something wasn't right and they said it was my problem and if i wanted to do it again it would be another 65 for 3 more runs. i told them no thanks, i enjoy having a mini van faster than a l98 with N2O according to paper.

 

well you know like I said in the eailer post, I think either the guys using the dyno didn't know what they were doing, or they screwed up. Like I said eailer, you should get another dyno done at a shop, especially since you could hear the nos kick in, and only get 2 hp out of it. Doesn't sound right.

 

Since you know your 1/4 times, try this link. I think it might give you something to put those dyno numbers against, although I don't know how accurate it is:

http://www.supersixmotorsports.com/h...calculator.htm


Also, maybe these calculations can help you too:

flywheel hp = rwhp/0.8
rwhp = flywheel hp * 0.8

223 rwhp / 0.8 = ~279 hp at the flywheel