Just had my car dynoed

I went with the local fbody group to a speed shop outside of Toronto and got my car on there. I was hoping for a bit more power but the car needs some tuning and I need to make sure its running right.

1st Pull = HP 172.4 TQ 284.8
2nd Pull = HP 186.3 TQ 276.8

Its an 89 5.7L TPI automatic. Its rated at 230hp/330tq from the factory. Basically all it has is an exhaust system and K&N filters. Its was running rich too but I guess its not too bad.

Before you call it a piece of shit keep in mind it has 260,000 kms on it and the motor/tranny have never been opened up. There were sparks shooting out of the exhaust when it was probably around 4500. I guess I should try and clean up the fuel injectors and see if my plugs and wires are ok.

Thats not too bad considering how many km's are on the car! But I think its time for a rebuild!

I might do something about the tranny but the engine isnt getting rebuilt till the rear main seal stops dripping oil and starts pissing it or the whole thing blows.

I might do something about the tranny but the engine isnt getting rebuilt till the rear main seal stops dripping oil and starts pissing it or the whole thing blows.

"lets just wait till my engine destroys itself"

sorry to be a smartass, but it doesn't seem smart to me, that's a nice motor the 5.7 tpi, i would let it crumble... just my :2cents:

The only part I plan on using off the motor is the upper TPI plenum and maybe some of the fuel injection goods. Everything else is crap, if I can reuse the block thats fine but to replace it will only cost a couple hundred bucks. Im having it machined for 4 bolt splayed caps too so any block will be fine really.

Everything else is going in the trash.

The only part I plan on using off the motor is the upper TPI plenum and maybe some of the fuel injection goods. Everything else is crap, if I can reuse the block thats fine but to replace it will only cost a couple hundred bucks. Im having it machined for 4 bolt splayed caps too so any block will be fine really.

Everything else is going in the trash.

sell it, its good to recycle, keep the v8's alive!!

kinda shaky there...when was the last time you serviced your ignition system (including having quality, not cheap, wires)?

I havent done crap to the car since I bought it last summer. Is that what would cause the spikey graph?? Also, near WOT there were sparks shooting out of the exhaust. It seems to be running a little rich but I dont know how to fix that.

yeah man, do a good tune up with some quality stuff and see how it runs. Usually when it is wavy like that it is from Wires. I am also looking at how flat your HP curve is and how drastic the drop is on the TQ curve. could be from the Ignitions system, weak valve springs, or bad rings! Check for blowby or do a compression test as well to see if the rings are good.

gettng near the spark plugs is almost impossible because of the headers maybe ill try taking one out and seeing how bad it looks.

yeah, because something is not right. your HP should not stop climbing at 3600 RPM's. Do you have a stock TQ convertor? Might want to find some stock 5.7 tpi graphs and compare yours to see where the figures should be, but I cannot see the Heads flowing that poorly to stop making power that early.

Ya the torque convertor is stock and lately ive been having code 24 go off with is VSS and i think that might control tc lockup but i dont know. ITs got alot of km on it though so maybe thats a problem.

how much did you pay to get ur car dynoed?

yeah i dont wanna say its a bad run, but you are deffinetly losing some power somewhere, and im not just talking about drivetrain loss.

Actually your numers are not that bad. The equation for your automatic is as follows:

FWHP X .85=RWHP

You are not so off the mark.

Counting in a 20% drivetrain loss im somewhat close but ive also got a full exhaust system and some intake work done.

I paid 45 bucks cash to get my car dynoed. They will let you run it or they can do it and you get 3 pulls.

Somethings definately wrong because there was a guy there with a 305 TPI and he made 208 hp and his car is bone stock.

I think the wires on the car right now are NIEHOFF or something like that. I dont know about plugs or anything else. What should I spend my cash on for the ignition system??? I dont want to blow another 500 or something but Id like to try and get the car running better.

Also it idles at about 600, is there anyway to tell if my cam has been changed without taking anything apart??

well i dont wanna argue with math but hey if you want my .2 youre losing at least a good 30hp. wasnt sure if you did but id get a good tuneup, have the driveshaft and tranny checked out, or it could be some worn gears. the numbers dont exactly surprise me at all, but there ya have it.

Just found STOCK dyno numbers from an 89 Iroc Z.
214 rwhp and 312 ft-lbs at the wheels. that is 35hp more than your average and 32ft-lbs more, with no mods. You definately have something funky happening. 35rwhp and 32 rw ft/lbs is A LOT of power missing.