95 on the Dyno

My first dyno run with 2.6 pulley and 36lbs injectors. Toping off lean 12.0. Real bad run, but my new chip from Sinister Performance should fix it and will be pulling another run in about a week, might be going to a smaller pulley too.

Makes power pretty quick.... falls on its ass at 4k though... Would you mind if i post mine just to compare the curves??

sure I would like to see it too

Main difference is my TQ curve is WAY different than yours.. i had headers, 1.9RR, and a 3.4 pulley and no tune on this dyno.. and zero cool down time between pulls

Notice that Travis' graph has the RPMs spaced out further apart, giving the illusion of a flatter curve. On the same graph format, I think they build about the same rate, but the '95 would start building sooner. Also the '95 started recording sooner.

The 4k dip looks like a shift or letting off the throttle. If the run was pushed to 5.5k RPM, I think it would look more "normal". Was this run done entirely at WOT in 2nd gear?

AA wrote:

Notice that Travis' graph has the RPMs spaced out further apart, giving the illusion of a flatter curve. On the same graph format, I think they build about the same rate, but the '95 would start building sooner.

The 4k dip looks like a shift or letting off the throttle

Good Point!

98riviera98 Wrote:
Headers, 1.9's, Gen V, N*, 3.1

just your average 270whp riviera..

Is that just wishful thinking? or are you calculating future mod's in your current sig. ????

Based on the Dyno sheet your not there yet.!!!!!!

Rickw wrote:

98riviera98 Wrote:
Headers, 1.9's, Gen V, N*, 3.1

just your average 270whp riviera..

Is that just wishful thinking? or are you calculating future mod's in your current sig. ????

Based on the Dyno sheet your not there yet.!!!!!!

270whp is conservative...... That dyno was right after i installed the headers and rockers... back when i had the gen 3 on and after it was tuned and i had the 3.15 on there i would have easily made 240-250whp gen v is an addtl 20whp plus i got injectors and e85.. i am hoping for 270whp but when i make 280whp i will be really happy

no it was done in 3rd gear at wot. That what the guy told me it sould be in

ricos20002 wrote:

no it was done in 3rd gear at wot. That what the guy told me it sould be in

Yup mine was in 2nd gear..

does it make a difference?

ricos20002 wrote:

does it make a difference?

nah not really 3rd gear is the tranny's 1:1 ratio.. i had snow tires on the front of my car so my tuner didn't wanna wind it up to 130+mph on the dyno

thats what I thought about 3rd

Quote :

270whp is conservative......

Your Riv makes 232 WHP. Go back to the dyno and get a better number. BTW, a 40 WHP jump is ANYTHING but conservative!

FYI, my 248 WHP was done at 80ºF with 3.4" SC pulley. I know for a fact I'm making more power at 50ºF and a 3.3" pulley (~265 WHP), but I won't say it makes that much power until it's recorded on the dyno.

AA wrote:

Quote :

270whp is conservative......

Your Riv makes 232 WHP. Go back to the dyno and get a better number. BTW, a 40 WHP jump is ANYTHING but conservative!

FYI, my 248 WHP was done at 80ºF with 3.4" SC pulley. I know for a fact I'm making more power at 50ºF and a 3.3" pulley (~265 WHP), but I won't say it makes that much power until it's recorded on the dyno.

ur right... so what your saying is that you want to race me from a dig?

I'm thinking some of my lean condition might be my fuel pump, is mine a 2 speed pump, and is there one u would recommend?

Quote :

ur right... so what your saying is that you want to race me from a dig?

No, I was saying you don't make 270 WHP... yet.

AA wrote:

Quote :

ur right... so what your saying is that you want to race me from a dig?

No, I was saying you don't make 270 WHP... yet.

once i go throw this bin on here i will be in the generally area hopefully. i can't drive my car for a few weeks cuz of the meds im on for lyme disease... hope to sneak the tune on within a few days here

wow thanks for your help guys

ricos20002 wrote:

wow thanks for your help guys

guessing that was sarcasm, since nobody has acknowledged your questions yet.
the fuel pump in the 95 is probably the typical dual stage pump used on 3800 cars.
what makes you think it is the pump dying? in my opinion your lean condition is caused by the pulley used, &/or lack of tune. did you get the 36lb injectors new or did they come bench flow tested so you know they are putting out? and the fuel filter is newish too right?


good run btw.

ricos20002 wrote:

wow thanks for your help guys

oh geeeez i'm sorry.. I doubt your fuel pump is what's holding you back!! i think you should just wait to get your PCM back from sinister and than shoot from there

ty

ricos20002 wrote:

ty

no problem sir! Have you ever thought about doing a Series II swap?

ricos20002 wrote:

I'm thinking some of my lean condition might be my fuel pump, is mine a 2 speed pump, and is there one u would recommend?

fuel pump speed is controlled by a variable ground via the PCM. Some aftermarket companies make a 'hotwire' kit that uses a relay to give the FP a full ground all the time. You would know if you are running out of fuel by watching your injector pulse width and your fuel pressure at WOT (which you can probably only do on a dyno). If you are maxing out your injectors you only have a few options - raise your fuel pressure, or get bigger injectors. If you have fuel pressure remaining and are not maxing out your injectors, you can probably increase your fuel with a "Mini-AFC" - a device which interperets the MAF signal and tricks the PCM into thinking you are flowing more air, so it will deliver more fuel.

Fuel pump hotwire kits are made for Grand Prixs '97 and later, not sure if/how they will work out on a '95 as the PCM is different. Those and Mini-AFCs can be found from Intense Racing and ZZPerformance.

On a '95, I don't think you have many other options.

Good luck!