Here is the situation. I rebuilt my LG4 , it was totally stock and was bolted up to a TH200. After I put a Edelbrock Performer Cam and Intake , also bolted up to a TH350 with a shift kit (way better trans ) Before I moded the engine I raced my friends 87 Z28 and killed him then after I did the mods he killed me. He has done no mods or any thing to his car since I have. How am I losing power???? Does the dual plane intake not like the Q-Jet carb????? Thats the only idea I have.

------------------
82' Z28 T-tops
305 LG4 with TH350

 

Death,

Does teh suspension not like the extra launching torque?

------------------
Later,
Vader
------------------
"Let the bodies hit the floor!"
Adobe Acrobat Reader

 

A very simple fix would be lower control arms. I put a set of Lakewoods on my 86 and I have a hell of a lot less wheel hop and almost no spinning of the tires when I slam on the gas from a dead stop. You can get a set of Lakewoods from Jeg's dirt cheap and Spohn makes a kickass set that are adjustable.

------------------
1986 Firebird, LG4 305, bored .040 over, Crane cam, Edelbrock headers, Hooker Aerochamber muffler, loud and fast.

"Gimme fuel, gimme fire, gimme that which I desire!" - Metallica, "Fuel"

 

another theory would be that the 700R4 that was in it (it shouldn't have been a 200r4) had a lower 1st gear ratio and the car left the line better.

Now your not in your power band as well on the 1-2 shift and you buddy probably is by that time.

That and traction and driving technique all come into play now.




------------------
Mike L.


1987 IROC Z TPI 350 A4 3.27 Borg-Warner.

Mods: 2300-2500 Stall Converter, Shift Kit(GM parts), TPI Specialties Stage 3 PROM, Modified Airbox w/ K&N's, Relocated MAT sensor, Gutted MAF, Accel 8mm Wires, bypassed TB coolant, Flowmaster 3 chamber single 3" in/out muffler, airfoil, Random Tech Hi-Flow Converter (soon to go byebye!). ALL STOCK otherwise.
http://www.MichaelLasiuta.home.att.net

**BOYCOTT LAPEER DRAGWAY**

 

The q-jet will love the dual plane Performer manifold...

------------------
1984 z28 w/ a 357 cu in. monster engine which is looking like the posterchild for Edelbrock with the exception of the Holley 750vac... all the suspension stuff... 9-bolt posi disk is in...

-=ICON Motorsports=-

 

Some problems with this that I see, and this is no flame. The TH200 that he was refering to was the 200c, which was the only automatic tranny avaliable in 82, not the 200-4R. Secondly, let's just say for ****s and giggles he had the 700R4, which simply isn't possible if it's the stock tranny. The 1-2 shift of the 700 will RIP most motors right out of their power ranges, especially when compared to the closer ratio 350/400/200c/2004R trannys. Maybe I'm missing something?

I say, check the little things. Ignition timing, wire condition, carb tune, remember, all an engine requires is air, fuel, and spark, so your problem has to be in one of those three things, unless it's merely a traction problem like stated above.



[This message has been edited by Slow Iroc (edited May 28, 2001).]

 

I wish it was a tracsion problem.Its not though , when I hit the gas I get no wheel spin at all. It feels like the car wont respond for a second but when it gets to the shift from one to two it chrips the tires. Do you think that I'm not getting any power to the rear wheels because of a gear ratio of 2.73?????????????

 

Are you running the stock exhaust? If so, then i would expect no appreciable gain in HP from the cam and intake, especially the wimpy edelbrock cams. Add in that the th350 will take fractionally more HP to turn (while weak the th200 does have low driving HP to it's advantage) and you are about even with where you were. Throw in i odn't know where your timing was set at before/after and you could easily be down on power. Plus we don't even know what kind of race you're talking about and well, nothing here seems too weird to me yet.
Yes those 2.73s are strangling you, but they're the same gears you had before, and unless you went nuts with the RPM cam your powerband hasn't really changed so they're not hurting you any worse.
I think you should check your timing and basic tune up stuff. If you haven't done so, read my tech article on a few simple tweaks for your carb, and then see how it does.
...ed

ps which cam are you running?

------------------
Ed Maher - Moderator @ The Carb Board
92 Z28 Convertible - Quasar blue / Tan top
LB9 4L60 GU2 G80 - stock, soon to be sleeper
-=ICON Motorsports=-

- Definitely prototypes, high powered mutants of some kind. Too weird to live, too cool to die

 

The exhaust that i'm runing isnt that great , 80 series flowmaster and gutted cat.All the pipes are 2.5". Sorry i dont know all out advancing/retarding the timing.What are the effects , could this help me fix the problem ?

This is what have:
- performer intake (EGR) #3701
- performer plus cam #3702
- stock Q - Jet
- 8mm wires
- stock heads and pistons
- all on a LG4

So out of all of this , the only reason i dont feel any power increasements is because of the difference of the TH350 and the TH200.So if i do get better rear ratio , and some headers then i'd feel it ?

------------------
82' Z28 T-tops
305 LG4 with TH350
[IMG]http://www.camaro_z28.homestead.com/files/deathz.gif[\IMG]

 

If you slapped the new intake on and just installed the distributor then your timing will be off from before. Timing is set by loosening the distributor hold-down bolt and turning clockwise to retard/counter clockwise to advance. It's good to have a timing light but most guys will advance it until it pings and then retard it some. I'm guessing it's too retarded which will squash your power. You should definitely have more power than before.

Your exhaust is alright, certainly better than stock - however the best dual setup in the world would do little bolted up after those restrictive stock manifolds. Headers would open it up alot.

 

This is probably to easy, but maybe your throttle cable is not pulling the carb wide open? Check your adjustments around the carb. Sounds like you just are not getting the car into WOT. Later

------------------
Pics of my Car

http://albums.photopoint.com/j/View?...781&p=39417549
http://albums.photopoint.com/j/View?...781&p=39417539
http://albums.photopoint.com/j/View?...781&p=29492902
http://albums.photopoint.com/j/View?...781&p=29492901
305TBI, EDL strut tower brace w/spohn SFC's on the way and wonderbar, ASCD big block hood,
Eibach Sportline Springs,
Koni Struts and Shocks,
SSPE lower control arms and Panhard bar,
Hellwig Rear Swaybar and Energy Suspension bushings.Aluminum Driveshaft. Posi-rear

 

yea, if its just not spinning like it used to, i'd bet its your timing.. advance it , like the previous guy said.. i had the same problem, and a local mechanic, for the h3ll of it, started playing w/the timing one night..wow, it would almost snap my head off since it was so much more responsive

------------------

• 83 Z28-- not a pretty site to look at, 200k miles and im sure it was treated like a rental car every day of its sad life(before i got it).. sold, thank the lord
• 74 Z28-- 383/400, green on black. pretty clean. FOR SALE!!!