Dyno numbers any one interested? - Aftermarket Product Review - Third Generation F-Body Message Boards

cmk-2 · 02-23-2008, 11:23 PM

Hi all, I'm sure this has been done to death I did a search but couldn't find anything. So let me know if anyone is interested. I have an 1987 5.7 iroc with 28,000 miles totaly stock even ac/delco airfilters. I'm going to do some mods and see what the dyno says. My plan: This week I'm going to the local dynojet and get a base line then I'll install a test pipe with a new Dynomax 2-1/2 catback system, drive it a couple of days for the computer to adjust and do another pull trying to match weather conditions of the first (airtemp,humidity). Next I'll install the TPIS bigmouth intake,TPIS LTRS, ported plenum (from corvetteplenum) drive a few days and do another pull with weather conditions as close as poss. I have ordered but not received yet a Holly afpr and a TB by pass kit and the Mac's y-pipe when I get those items I'll do one more pull for the final hp/tq inprovement. If this has been done before and I just can't find it let me know and I won't waste anyone's time. If anyone has ideas about this that I have over looked please let me know. Robin Bailer

xpndbl3 · 02-24-2008, 01:43 AM

2.5" catback system is a waste of money....stock is 2.75 IIRC, get the 3" catback. Also you'd spend what $500 on different dyno days just to see a 25hp difference, I wouldn't bother. The dyno corrects to SAE conditions, so weather won't matter.

Orr89RocZ · 02-24-2008, 02:23 AM

i'd be interested in seeing the baseline vs full bolt ons/tune.

I would estimate 215whp stock and 240 with the full bolt ons and tune. Possibly 250whp

But definately do the 3inch catback exhaust. headers/ypipe would be the biggest hp gainers tho. You probly wont see a whole bunch of power without the headers/ypipe combo

cmk-2 · 02-24-2008, 03:21 AM

Fair enough..I won't waste anyone's time except with the base and final. Robin

91-RS-B4C-fake? · 02-24-2008, 09:57 AM

Hi Robin,

I sort of ran out of money.
So my build up has come to a stop.
Not sure when I'll get started again.
My not so scientific record of my step by step
is at Cardomain.com & at Dragtimes.com

http://www.cardomain.com/ride/2175519

http://www.dragtimes.com/Chevrolet-C...slip-5874.html

All the items you mentioned are things
I was also hoping to install.
SO..
I'd also be interested to see what the
TPIS big mouth
Large tube runners
and Ported plenum
will do to improve performance.

Any chance you'll eventually install
Headers
A 52mm Throttle body
the tpis ZZ9 Cam
and a set of 180 cc AFR eliminator heads.

cmk-2 · 02-24-2008, 12:41 PM

No, this is as far as I am willing to go with the mods. You did some great 1/4 mile runs with your mods.

Orr89RocZ · 02-25-2008, 01:10 AM

If you want to do the dyno info and stuff, it will be GREAT resource for thirdgenners, but it will cost some money to dyno the car everytime. I know my shop charges 70 bucks for 3 pulls, and thats cheaper than most.

If you dont mind doing that then it be great to see some gains after a catback, then after the TPI mods. It be better that you plan to use some headers since thats where the biggest restriction is i feel

then possibly play with timing/tuning to see how much extra you can squeeze out the full bolt on car

91-RS-B4C-fake? · 02-25-2008, 07:16 AM

Well in my opinion,
any information is always welcome.
Good luck.

cmk-2 · 02-25-2008, 07:53 AM

Thanks that's the way I feel...More information the better!!

cmk-2 · 02-28-2008, 07:33 PM

Well part 1: base line pull. Orr89RocZ You were right on target: 1st pull 209.6@4500,2nd 210.3 and 3rd 215.1. SAE. Next pull will be Monday with test pipe and Dynomax system installed. Temp 62deg and 50 % hum. Uncorrected 223@4400 Robin
----------
Also seems to me that GM WAY under rated the L-98 With the ZR-1 I've been told that a 16-18% drive line lost was normal I wonder what these are with the 4 sp auto?

Orr89RocZ · 02-28-2008, 08:39 PM

i'd say 18-20% is normal loss. Glad to see that car making good power, thats about what i expected a L98 in good running condition do. The other mods should pick up some power but headers will definately do it

Also try advancing the timing from 6 degrees base to 8 degrees. you'll gain some torque and alittle hp

SLP-GTA · 02-28-2008, 10:00 PM

cool thread.

Suggestion, First, I love to see you install TPIS bigmouth intake,TPIS LTRS, ported plenum and make a pull, I think alot of us would love to see how much gain is made with these mods on a stock 350.

They say the LTRS is worth 25hp alone.

cmk-2 · 03-01-2008, 09:56 AM

Update...Yesterday I had the test pipe and Dynomax cat-back installed..VERY quite not what I expected. Abit more rumble and vibration with it shifts into 4th but not bad. Will disconnect battery and make a few full throttle passes to reset the ecm. SLP-GTA good idea I'll do just that. Next pull Monday weather permitting. Robin

flaming-ford · 03-01-2008, 10:35 AM

awesome good info here i'll be lurking and reading!

Orr89RocZ · 03-01-2008, 11:50 AM

runners and base will net near 25hp but not with the runners alone. stock base would still be restrictive

cmk-2 · 03-12-2008, 09:52 PM

Ok, went to the dyno today. Only change is no cat and 2 1/2 inch dynomax cat back exhaust. 228 hp and 308 fl-lbs torque. That's a 13 Hp peak increase with an avg of 10 hp all thru the curve. But the big increase is the TQ with an avg. of 20 ft-lbs and a peak of ...wait for it...24ft-lbs. Not bad for $189.00 and $50.00 install. next ..TPIS LTRS Ported plenum and TPIS loud moth intake. Robin

Orr89RocZ · 03-12-2008, 10:56 PM

very nice, that should pick up with headers for sure. i'm thinking near 240whp or so with shorties and then another near 10 with the intake upgrades, but your rpm range should go up alittle

cmk-2 · 04-15-2008, 04:29 PM

OK sorry for the delay but here is the lastest numbers..... From my last run peak HP 228 Peak TQ 308. Now with TPIS LTRs,Big moth intake,TPIS AFPR, TPIS plug wires....AVG HP gain 10-19 under the curve with a peak of 10Hp no where did it lose HP now peak is 238 . the peak BTW has moved 400 rpms up to 4800.TQ only went up 6-8ft-pounds. but lost at the peak to 302.Let me say abit about the company TPIS First the sent the wrong year intake (89 and newer no cold start injector) But Jim at TPIS was more then will to make it right he called my service tech and told him what to do to fix the problem. Then TPIS sent the wrong plug wires. Jim again called and had the tech measure the wires and sent custom made wires NEXT DAY at their expense. We all make mistakes it's how you handle them that marks a truly great person or company and TPIS is first rate in my book. Next and last upgrade is the MAC 2 1/2 Y-pipe and we'll see what the final numbers will be. Robin

1989GTATransAm · 04-15-2008, 04:39 PM

Thanks for the update. It is always good to have back to back data like you did.

Orr89RocZ · 04-15-2008, 07:36 PM

very nice numbers so far! Intake stuff looks to be worth near 15-20hp on motor which is near what i had in mind. 10whp peak is nice but 10-19 everywhere is what its all about

And to think this car has no headers right? just stock manifolds? And no real chip tuning. thats impressive. This car should run bottom 13's if setup right and in good weather

cmk-2 · 04-15-2008, 10:46 PM

Stock manifold and stock chip.Chevy sure did under rate these engines, Robin

SLP-GTA · 04-15-2008, 11:10 PM

This is a great thread, I really appreciate you taking the time to post your results.

It would be extra special if you can scan the graft to show the power curve improvements.

Also what did you set your fuel pressure at?

TMZIrocZ350 · 04-15-2008, 11:19 PM

I ran my car on the dyno a little while back and was suprised with the numbers. My car is an 89 L98 with edelbrock shorties, high flow cat, flowmaster cat back and K&N filters. Everything is bone stock. She put down 240 whp and 320 wtq. Not too bad. A set of headers and y pipe is going to be one of largest improvemenst you can do.

Reid Fleming · 04-16-2008, 12:27 AM

Just a little bookkeeping for those reading.

Stock: 215 HP
!cat & 2.5" Dynomax: 228 HP and 308 TQ*
TPIS LTR, Big Mouth, plug wires: 238 HP and 302 TQ**

Overall gain = 23 HP

* HP peak @ 4400 RPM
** HP peak @ 4800 RPM

Reid Fleming · 04-16-2008, 12:45 AM

I'd be interested to know how much changing the fuel pressure makes on the dyno.

cmk-2 · 04-18-2008, 09:08 PM

Well I don't have the tech skill to scan and I don't have the equip. to do it if I knew how. Sorry I'm not a computer guy. BTW we got the best HP/TQ with only 43 for fuel pressure. We started with 47 went up and lost power on the dyno then started going down with psi and power went up until we dailed in at 43psi. Robin

Orr89RocZ · 04-18-2008, 10:08 PM

Quote:

Originally Posted by cmk-2

Well I don't have the tech skill to scan and I don't have the equip. to do it if I knew how. Sorry I'm not a computer guy. BTW we got the best HP/TQ with only 43 for fuel pressure. We started with 47 went up and lost power on the dyno then started going down with psi and power went up until we dailed in at 43psi. Robin

many buy into the fuel pressure mod giving power but it doesnt if the car already runs rich from the factory.... more fuel will not make more power if its currently rich

my car was the same way. stock fuel pressure it was 12.3 to 1 air/fuel...abit rich. 1 full point leaner would have made some power. More fuel wouldnt have done much at all

91-RS-B4C-fake? · 04-19-2008, 11:08 PM

Sorry to duplicate things, but
I sent you a PM a couple of days ago.
I was just curious......

I was asking about the TPIS big mouth intake you installed.
Did you port the runner entry’s ???
Or order it already ported???
Or did you just install one right out of the box???

cmk-2 · 04-20-2008, 07:17 AM

Hey sorry I didn't see that I had a PM. I had the TPIS runners and TPIS intake installed right out of the box. BTW we tried advancing the timming to 8 deg. from the factory 6 but the computer kept pulling out 12 des. so we set it back to 6 and the computer still pulled a few degs. ANY ideas why?? I always run the 92-93 gas so that's not it,unless I have a bad tank full this time. Robin