big disapointment
#1
big disapointment
Just got back from the track with my fresh carbed 370lq4
Build thread
http://www.thirdgen.org/techboard/or...-lq4-91rs.html
Engine
2004 lq4
.030 with forged flattop pistons. Ls2 rods. Stock crank
821 (ls3 heads). Ported valve job and milled. 035". Flowed around 360 cfm at. .700 lift
eps custom grind 235*/251*@050" 621/632 lift 110+4 installed straight up
Jp roller timing set.
.040 head gasket
Prc. .650 spring kit titanium retainers
7.325"pushrods
Ls7 lifters with. 080" preload
1 3/4 primary 3 collector longtube headers. 3"duals.
Port matched l92 victor jr 1"spacer
850 proform carb. 80 jet primary with 6.5 pv. 88 jet secondary
msd 6010 set at 35* timing straight across.
Tr55's gapped. 040"
Holley black fuel pump set at 8psi
Specs
1991 Camaro
-Full suspension with drag springs and shocks
-th400 w/ brake. 8"converter 4500 stall.
- Moser 9" 4.11:1 locker
- 28 x10.5s x15 et drags with skinnies up front.
- est 3300 lbs
With the old mismatched solid roller 383 sbc it ran 11.52@ 116 mph with 1.525 60 foot. Only thing changed was engine over the winter.
Leaving off brake at 3700rpm
Best run was
60'. 1.657
330'. 4.963
1/8. 7.730
Mph. 88.78
1000' 10.112
1/4. 12.135
Mph. 111.17
Shifting between6500-7200 rpm had no effect on mph.
Feels like it doesn't like anything over 7000 rpm. It originally was cutting out at high rpm so I jetted up 4 sizes from 76/84 to 80/88 helped a lil as far as missing out up top but no help in mph or et.
Did a hot compression test
All cylinders 190-200 psi
What gives guys?
Build thread
http://www.thirdgen.org/techboard/or...-lq4-91rs.html
Engine
2004 lq4
.030 with forged flattop pistons. Ls2 rods. Stock crank
821 (ls3 heads). Ported valve job and milled. 035". Flowed around 360 cfm at. .700 lift
eps custom grind 235*/251*@050" 621/632 lift 110+4 installed straight up
Jp roller timing set.
.040 head gasket
Prc. .650 spring kit titanium retainers
7.325"pushrods
Ls7 lifters with. 080" preload
1 3/4 primary 3 collector longtube headers. 3"duals.
Port matched l92 victor jr 1"spacer
850 proform carb. 80 jet primary with 6.5 pv. 88 jet secondary
msd 6010 set at 35* timing straight across.
Tr55's gapped. 040"
Holley black fuel pump set at 8psi
Specs
1991 Camaro
-Full suspension with drag springs and shocks
-th400 w/ brake. 8"converter 4500 stall.
- Moser 9" 4.11:1 locker
- 28 x10.5s x15 et drags with skinnies up front.
- est 3300 lbs
With the old mismatched solid roller 383 sbc it ran 11.52@ 116 mph with 1.525 60 foot. Only thing changed was engine over the winter.
Leaving off brake at 3700rpm
Best run was
60'. 1.657
330'. 4.963
1/8. 7.730
Mph. 88.78
1000' 10.112
1/4. 12.135
Mph. 111.17
Shifting between6500-7200 rpm had no effect on mph.
Feels like it doesn't like anything over 7000 rpm. It originally was cutting out at high rpm so I jetted up 4 sizes from 76/84 to 80/88 helped a lil as far as missing out up top but no help in mph or et.
Did a hot compression test
All cylinders 190-200 psi
What gives guys?
Last edited by jgillen91; 04-04-2012 at 08:22 PM.
#5
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Who specd your carb? Ive got a similar setup and my carb was specd between 980 and 1040 cfm (pro-systems). I have less compression, my heads (stock 821) flow less and my cam is 1 degree less on both sides. I do weigh 800 lbs less tho.
#6
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#7
thanks for everyones suggestions. i have a game plan and a list of stuff i need to make sure is spot on.
going to run a new fuel feed set up 1/2 lines all the way to front with a nice flowing filter. ( currently running origional lines and canister filter)
also going to throw relays on everything. gotta make sure this stuff is getting a constant 12 volts!!!!
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#8
just had a dumbass moment!!!!!!
had the girlfriend jump in the car and hold gas pedel to floor. secondaries are about 1/8 of the way open. throttle stops when primaries are not quite all the way open and secondaries and just starting to open
had the girlfriend jump in the car and hold gas pedel to floor. secondaries are about 1/8 of the way open. throttle stops when primaries are not quite all the way open and secondaries and just starting to open
Last edited by jgillen91; 04-05-2012 at 01:33 AM.
#9
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Woohoo! Ha, I was hopin for somethin simple. I was gettin disappointed myself, thinkin these builds ran faster than that. I was askin about the carb cuz they specd me a bigger one and I was worried its too big but im prolly fine. Good luck! Post a vid of the next run!
#16
10 Second Club
iTrader: (8)
http://youtu.be/wAXicGT1Ow0
Look familiar? I've been messing with mine but I still can't get WOT.
Should mention I used my iphone to record the video while I hit the throttle. That's what I came up with since I work 99% of the time on my own.
Last edited by 1970camaroRS; 04-05-2012 at 01:05 PM.
#17
I had the exact same problem with mine. This is what I would during the winter tear-down.
http://youtu.be/wAXicGT1Ow0
Look familiar? I've been messing with mine but I still can't get WOT.
Should mention I used my iphone to record the video while I hit the throttle. That's what I came up with since I work 99% of the time on my own.
http://youtu.be/wAXicGT1Ow0
Look familiar? I've been messing with mine but I still can't get WOT.
Should mention I used my iphone to record the video while I hit the throttle. That's what I came up with since I work 99% of the time on my own.
#20
TECH Fanatic
iTrader: (17)
if the primaries go vertical and the secondaries are still not all the way open, the linkage that goes to the secondaries needs to be shortened. you can do this by taking it off and bend it to a slight U-shape. this linkage is on the driver's side of the carb.
here's a picture of the linkage
here's a picture of the linkage