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estimates on 1/4 mile times for a 305??

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Old 09-10-2003 | 09:33 PM
  #1  
Ghigman3's Avatar
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From: OK, USA
Car: '87 IROC-Z
Engine: Modded 305 TPI
Transmission: 700r4
estimates on 1/4 mile times for a 305??

I'm trying to work out what I might make in the 1/4 mile since I don't have time to make it out to the track to see what it will really be so I thought I'd ask you guys.

My setup consists of:
- 305 LG4 converted to TPI
- LT1 cam
- 700r4 tranny
- 3.27 gears
- Subframe connectors
- 22lb injectors/350 ECM (that's what came with TPI setup...plugged scanner into ECM and I'm not running rich so I'm cool )

Mods to engine besides cam:
- TPS set to .65
- cut air bottoms off air cleaner

I've estimated the car weighs about 3400-3500lbs just from ruff guestimations. So yeah what do you think it will do in the 1/4 mile and any ideas on what I can do that is free/cheap that would help me out a bit.

Thanks,
Mark
Old 09-11-2003 | 02:23 AM
  #2  
irocz eric's Avatar
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From: The Cheese Head State - GO PACKERS!
Car: 86 "Ram Air" IROC
Engine: 305 5.Slow
Transmission: 700R4
i'd say mid to low 15s
Old 09-11-2003 | 05:17 AM
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From: N. Illinois
Car: 92 GTA/ 00 TA
Engine: 383/350
Transmission: 700R4/T-56
Re: estimates on 1/4 mile times for a 305??

Originally posted by Ghigman3
Mods to engine besides cam:
- TPS set to .65
Mine was set at .65 and I found that it was actually .3 slower in the quarter as opposed to the correct setting of .54.
Old 09-12-2003 | 04:29 PM
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Ghigman3's Avatar
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From: OK, USA
Car: '87 IROC-Z
Engine: Modded 305 TPI
Transmission: 700r4
so what could I do to make it get into the low 14's?.....besides droping in another engine :-)
Old 09-12-2003 | 05:37 PM
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From: Norfolk, VA. USA
Car: 86 Trans Am, 88 Formula
Engine: 95LT4, 305TPI
Transmission: T56, T5
My LG4 5 speed with a Edelbrock carb and intake swap, stock manifolds, stock exhaust, ran a 14.94 @ 91.67mph.


I did a TPI swap with cam, TPI heads, SLP Dual CAI, MSD 6A, Blaster 3 coil, Dynomax shorty headers, custom y-pipe, 3" catback, 52mm tb, 19lbs injectors, and I ran a 14.1@99mph with the car running in limp home mode.

Here is a 15.24 run with the LG4, http://www.transamws6.com/video/Manny_vs_Charles.mpg

This is a 15.04 run,
http://www.transamws6.com/video/Manny_1504.mpg

Here is the car after the TPI/Cam swap,
http://www.transamws6.com/video/ZepherWS6.mpg
Old 09-12-2003 | 06:07 PM
  #6  
Ghigman3's Avatar
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From: OK, USA
Car: '87 IROC-Z
Engine: Modded 305 TPI
Transmission: 700r4
I was kinda hoping there was something I could do that wasn't going to cost that much......while I'd love to do those things I rather don't have the cash to do them right now.... ohwell....

Hey Zepher....Do those headers allow for easy or semi-easy access to the spark plugs?

Last edited by Ghigman3; 09-12-2003 at 06:17 PM.
Old 09-12-2003 | 06:21 PM
  #7  
Zepher's Avatar
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From: Norfolk, VA. USA
Car: 86 Trans Am, 88 Formula
Engine: 95LT4, 305TPI
Transmission: T56, T5
Originally posted by Ghigman3
I was kinda hoping there was something I could do that wasn't going to cost that much......while I'd love to do those things I rather don't have the cash to do them right now.... ohwell....

Hey Zepher....Do those headers allow for easy or semi-easy access to the spark plugs?
Plug access was pretty easy since there aren't any AIR tubes on them.

I have Hedman Longtubes on my LT1 in my 86 and plug access is super easy. I can do plugs in less than 5 minutes.
Old 09-12-2003 | 06:27 PM
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Ghigman3's Avatar
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From: OK, USA
Car: '87 IROC-Z
Engine: Modded 305 TPI
Transmission: 700r4
Thanks, now I've got an idea on which headers to get . maybe exhaust next summer.........or paint...........or rims............or new engine.........or...........
Old 09-12-2003 | 10:07 PM
  #9  
f-crazy's Avatar
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From: SE Michigan
Car: Bright Red 91 GTA
Engine: CARBED LT4
Transmission: MK6
as your car sits now...id say you have a low 14 in it
Old 09-13-2003 | 12:30 AM
  #10  
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From: ny-lindy
Car: 1989 Iroc z hardtop
Engine: peanut LB9
Transmission: slopomatic TH700R4
ifyou car is properly runing nd on a good day i woukld say a high 14. but
Old 09-13-2003 | 05:55 AM
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From: Fairview Heights Illinois
Car: 1986 Irocz
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 3.25:1
My vote is very low 15's.
Old 09-13-2003 | 07:07 PM
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From: Salem, NH
Car: 1999 Z28
Engine: LS1
Transmission: 4L60E
Axle/Gears: 3.23 10 Bolt
mid 14s
Old 09-13-2003 | 11:04 PM
  #13  
Ghigman3's Avatar
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From: OK, USA
Car: '87 IROC-Z
Engine: Modded 305 TPI
Transmission: 700r4
I'm curious.......do you think it would run better with a 350 or 305 ECM?
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