383 LT1 runs 13.30's
05-09-2008, 09:27 PM
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383 LT1 runs 13.30's So a friend of mine just got his new motor together a few months ago and recently got to the track and his best time was a 13.36@106 with a 2.23 short time on street tires. Heres the mods:
383 LT1 11.1:1 CR
236/242 cam
Ported Trickflow heads with valve job 2.04/1.6 I believe
TSP stg 3 T-56 with spec stg 3 clutch
342 rearend
full weight
Mail order tune by Mad Z
Has all the bolt ons long tubes, Full MSD, CAI, 58mmTB, True duals etc Stock suspension though with tublar LCA's
He knows how to drive fairly well because it ran 13.8 almost bone
I know a big part is his 60' because of the street tires but still a 106 trap speed doesnt make sense, what could be going on here? We know it needs a tire, a better gear and some suspension but like I said 106 don't sound right at all does it???
Here is a clip vs a H/C/I 2V Slostang GT
TA went 13.6@106 on 2.3 60"
GT Went 13.5
http://s133.photobucket.com/albums/q...llvsBusher.flv
383 LT1 11.1:1 CR
236/242 cam
Ported Trickflow heads with valve job 2.04/1.6 I believe
TSP stg 3 T-56 with spec stg 3 clutch
342 rearend
full weight
Mail order tune by Mad Z
Has all the bolt ons long tubes, Full MSD, CAI, 58mmTB, True duals etc Stock suspension though with tublar LCA's
He knows how to drive fairly well because it ran 13.8 almost bone
I know a big part is his 60' because of the street tires but still a 106 trap speed doesnt make sense, what could be going on here? We know it needs a tire, a better gear and some suspension but like I said 106 don't sound right at all does it???
Here is a clip vs a H/C/I 2V Slostang GT
TA went 13.6@106 on 2.3 60"
GT Went 13.5
http://s133.photobucket.com/albums/q...llvsBusher.flv
Last edited by HottLS1Z; 05-09-2008 at 10:16 PM. Reason: Added Video
05-09-2008, 09:40 PM
#2
Clearly something ain't right. I got my '94 Z28 down to 13.20's with just bolt ons and BFG DR's. Completely stock longblock and the suspension had been barely improved at that point.
So yes, a 383 with the parts you listed should be significantly quicker and faster. Without seeing the car, putting it on a dyno, and watching him make a pass, I'd be throwing darts at the board.
Need to dyno it with a wideband and a data logger. See what's going on and check the PCM tune thoroughly.
You pointed out the obvious, that the 60' absolutely sucks, but the trap speed is also very low, indicating the motor is not making the power it should, not by a significant margin. A healthy and properly chosen and assembled combo in a 383 LT1 should put down over 400 RWHP easily and result in... I dunno... high 11 sec timeslips? My 385 with CC306 and AFR 195's put down 432/468 and ran a best of 11.30 @120.5
So yes, a 383 with the parts you listed should be significantly quicker and faster. Without seeing the car, putting it on a dyno, and watching him make a pass, I'd be throwing darts at the board.
Need to dyno it with a wideband and a data logger. See what's going on and check the PCM tune thoroughly.
You pointed out the obvious, that the 60' absolutely sucks, but the trap speed is also very low, indicating the motor is not making the power it should, not by a significant margin. A healthy and properly chosen and assembled combo in a 383 LT1 should put down over 400 RWHP easily and result in... I dunno... high 11 sec timeslips? My 385 with CC306 and AFR 195's put down 432/468 and ran a best of 11.30 @120.5
05-09-2008, 09:41 PM
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i ran 13.3's with bolt ons and street tires with a 2.4 60! somethings wrong there! my buddy just built a 355 with mild ported stck casting and a small lpe can and ran a 12.2!
05-09-2008, 10:14 PM
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Here is the vehicle in question vs a H/C/I 2V GT
Here the TA ran 13.6@106 2.3 60"
Slostang went 13.5
http://s133.photobucket.com/albums/q...llvsBusher.flv
Here the TA ran 13.6@106 2.3 60"
Slostang went 13.5
http://s133.photobucket.com/albums/q...llvsBusher.flv
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05-10-2008, 01:59 AM
#12
need to dyno it...get it trapping about 120 125 then wonder why is isnt running 10's...its not making any power figure out why
60' isnt what i would worry about now...thats not the problem...cam only cars run 11's heads cam cars run 10's...he needs to trap like hes making power then worry about et
might be simple as fuel pump or filter..tune rockers sensor
60' isnt what i would worry about now...thats not the problem...cam only cars run 11's heads cam cars run 10's...he needs to trap like hes making power then worry about et
might be simple as fuel pump or filter..tune rockers sensor
05-10-2008, 04:49 PM
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oh yes... i have seen some nasty LT1's running the TFS heads... these heads are truely better with boost, they almost seem designed for boost... ... AI's TFS 215 is a nasty head with a good cam combo..