Planning for the next LTX shootout. What's with the LS1 PCM weight penalty?
01-01-2012 | 08:28 PM
#1
Planning for the next LTX shootout. What's with the LS1 PCM weight penalty? 1. I keep hearing from so many that the LSX PCM gets you no gains. If so then what's with the weight penalty of +100lbs?
2. Do I qualify for LTX Extreme Street? Thanx
2. Do I qualify for LTX Extreme Street? Thanx
LTX Extreme Street N/A
• Limited to quickest 32 qualifiers
• Sponsor: TBD
• Payout: TBD
Must have LT1-based engine. No power adders permitted. Heads must retain the factory 23 deg valve angle. Trick Flow 21 deg. heads permitted (PN TFS-30400008-M54). Only stock/stock ported intakes will be allowed. Welded intakes not permitted. LS1 PCM permitted with 100 lb. penalty. All other aftermarket EFI systems are prohibited. DOT approved tires only (includes DOT approved bias-ply tires). Radials must retain one of the following aspect ratios (275/50-15, 275/60-15, 255/50-16, 275/40-17, 315/35-17, 295/45-17, 325/45R17). 28″ maximum height and 10″ maximum tread width for bias-ply tires. Must have stock-style suspension. 4-links and ladder bars not permitted. Mini-tubs not permitted. No solid motor mounts, motor plates or anti-roll bars (aftermarket sway bars with solid end-links permitted). Must retain full OEM interior including both front seats. Aftermarket front seats permitted. Rear seats may be removed. Must have mufflers. Must retain OEM type transmissions of one of the following (700R4, 4L60, 4L60E, 4L80E, T56). No trans-brake or two-steps. Must have factory glass. Lexan windows not permitted. Must have working lights, wipers, horn. Must have current tags. Minimum race-weight limit 3,400 lbs. Independent rear suspension receives 200 lb. weight break. Car and driver must meet NHRA certifications for the time the car is running.
• Limited to quickest 32 qualifiers
• Sponsor: TBD
• Payout: TBD
Must have LT1-based engine. No power adders permitted. Heads must retain the factory 23 deg valve angle. Trick Flow 21 deg. heads permitted (PN TFS-30400008-M54). Only stock/stock ported intakes will be allowed. Welded intakes not permitted. LS1 PCM permitted with 100 lb. penalty. All other aftermarket EFI systems are prohibited. DOT approved tires only (includes DOT approved bias-ply tires). Radials must retain one of the following aspect ratios (275/50-15, 275/60-15, 255/50-16, 275/40-17, 315/35-17, 295/45-17, 325/45R17). 28″ maximum height and 10″ maximum tread width for bias-ply tires. Must have stock-style suspension. 4-links and ladder bars not permitted. Mini-tubs not permitted. No solid motor mounts, motor plates or anti-roll bars (aftermarket sway bars with solid end-links permitted). Must retain full OEM interior including both front seats. Aftermarket front seats permitted. Rear seats may be removed. Must have mufflers. Must retain OEM type transmissions of one of the following (700R4, 4L60, 4L60E, 4L80E, T56). No trans-brake or two-steps. Must have factory glass. Lexan windows not permitted. Must have working lights, wipers, horn. Must have current tags. Minimum race-weight limit 3,400 lbs. Independent rear suspension receives 200 lb. weight break. Car and driver must meet NHRA certifications for the time the car is running.
01-01-2012 | 09:11 PM
#2
It doesn't give you a direct gain if that's all you change but it removes the rpm limit allowing you to spin the engine higher thus the potential to make more power. Looks like you'd fit in Ex Street N/A.
01-01-2012 | 09:59 PM
#3
411 PCM setup would be a huge advantage since you won't be as RPM limited in your cam choice anymore.
A solid roller setup with a 255+ int cam for an 8,000 rpm 383 has the engine potential to totally destroy a smaller cammed 7,000 rpm street/strip car, and it wouldn't really be fair to have in the same class without some sort of penalty.
You should fit into ES N/A.
A solid roller setup with a 255+ int cam for an 8,000 rpm 383 has the engine potential to totally destroy a smaller cammed 7,000 rpm street/strip car, and it wouldn't really be fair to have in the same class without some sort of penalty.
You should fit into ES N/A.
01-01-2012 | 10:17 PM
#5
411 PCM setup would be a huge advantage since you won't be as RPM limited in your cam choice anymore.
A solid roller setup with a 255+ int cam for an 8,000 rpm 383 has the engine potential to totally destroy a smaller cammed 7,000 rpm street/strip car, and it wouldn't really be fair to have in the same class without some sort of penalty.
You should fit into ES N/A.
A solid roller setup with a 255+ int cam for an 8,000 rpm 383 has the engine potential to totally destroy a smaller cammed 7,000 rpm street/strip car, and it wouldn't really be fair to have in the same class without some sort of penalty.
You should fit into ES N/A.
01-01-2012 | 10:29 PM
#6
10 Second Club
Joined: Oct 2007
Posts: 2,630
Likes: 26
All of the rules for next year are being discussed on ltxtech.com . I know that in mod n/a they are trying to remove the weight penalty for aftermarket pcm controllers. Spinning the motor higher allows you to gear it more aggressively which is a big benefit, but you have to build the entire car around it.
01-02-2012 | 11:33 AM
#7
In a lot of situations the LS1 setup is a clear benefit and in a more street oriented class like ES there should be adjustments made for that to keep it form being a necessary mod to compete.
It stinks for the people who don't "need" the setup, and only went with it for reliability and tuning, but something had to be done either way.
I don't think it should have a penalty in MOD N/A, which are naturally more aggressive builds, but for a supposed "street" class builds have to be kept in check.
It stinks for the people who don't "need" the setup, and only went with it for reliability and tuning, but something had to be done either way.
I don't think it should have a penalty in MOD N/A, which are naturally more aggressive builds, but for a supposed "street" class builds have to be kept in check.
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01-02-2012 | 11:54 AM
#8
Im not too worried about the weight penalty. My car is far from the 3400lb weight limit as it is. Ive gone to the kit for reliability and to fix some upper rpm breakup that I have had for the last few years.
You qualify for the Extreme street. Hopefully Ill make it there to run both power adder and NA this year.
You qualify for the Extreme street. Hopefully Ill make it there to run both power adder and NA this year.
01-02-2012 | 01:02 PM
#10
Im not too worried about the weight penalty. My car is far from the 3400lb weight limit as it is. Ive gone to the kit for reliability and to fix some upper rpm breakup that I have had for the last few years.
You qualify for the Extreme street. Hopefully Ill make it there to run both power adder and NA this year.
You qualify for the Extreme street. Hopefully Ill make it there to run both power adder and NA this year.
01-03-2012 | 01:02 PM
#12
411 PCM setup would be a huge advantage since you won't be as RPM limited in your cam choice anymore.
A solid roller setup with a 255+ int cam for an 8,000 rpm 383 has the engine potential to totally destroy a smaller cammed 7,000 rpm street/strip car, and it wouldn't really be fair to have in the same class without some sort of penalty.
You should fit into ES N/A.
A solid roller setup with a 255+ int cam for an 8,000 rpm 383 has the engine potential to totally destroy a smaller cammed 7,000 rpm street/strip car, and it wouldn't really be fair to have in the same class without some sort of penalty.
You should fit into ES N/A.
01-03-2012 | 01:18 PM
#13
01-03-2012 | 02:05 PM
#15
01-03-2012 | 02:19 PM
#16
TECH Fanatic
Joined: Feb 2006
Posts: 1,025
Likes: 1
From: CT/NJ
BTW, you'd have to swap on a stock intake manifold too.
01-03-2012 | 05:28 PM
#17
On The Tree
Joined: Apr 2010
Posts: 162
Likes: 0
I am not sure if this helps, but the weight penalty for a LS1 vs. LT1 in Stock Eliminator is approximately 300 lbs. We have to all utililze the same rules so that may give you an idea of what a LS1 has as far as advantage over a LT1 in the same chassis.
01-04-2012 | 11:26 AM
#19
- Heads must retain the factory 23 deg valve angle. Trick Flow 21 deg. heads permitted (PN TFS-30400008-M54).
- Must have stock-style suspension. 4-links and ladder bars not permitted.
- Independent rear suspension receives 200 lb. weight break.
- Must retain full OEM interior including both front seats. Aftermarket front seats permitted. Rear seats may be removed.
- Must retain OEM type transmissions of one of the following (700R4, 4L60, 4L60E, 4L80E, T56)
Its like the class was built around certain cars so some are in and some are out. Seems dumb but it doesn't really matter to my life.
- Must have stock-style suspension. 4-links and ladder bars not permitted.
- Independent rear suspension receives 200 lb. weight break.
- Must retain full OEM interior including both front seats. Aftermarket front seats permitted. Rear seats may be removed.
- Must retain OEM type transmissions of one of the following (700R4, 4L60, 4L60E, 4L80E, T56)
Its like the class was built around certain cars so some are in and some are out. Seems dumb but it doesn't really matter to my life.
01-04-2012 | 11:46 AM
#20
- Heads must retain the factory 23 deg valve angle. Trick Flow 21 deg. heads permitted (PN TFS-30400008-M54).
- Must have stock-style suspension. 4-links and ladder bars not permitted.
- Independent rear suspension receives 200 lb. weight break.
- Must retain full OEM interior including both front seats. Aftermarket front seats permitted. Rear seats may be removed.
- Must retain OEM type transmissions of one of the following (700R4, 4L60, 4L60E, 4L80E, T56)
Its like the class was built around certain cars so some are in and some are out. Seems dumb but it doesn't really matter to my life.
- Must have stock-style suspension. 4-links and ladder bars not permitted.
- Independent rear suspension receives 200 lb. weight break.
- Must retain full OEM interior including both front seats. Aftermarket front seats permitted. Rear seats may be removed.
- Must retain OEM type transmissions of one of the following (700R4, 4L60, 4L60E, 4L80E, T56)
Its like the class was built around certain cars so some are in and some are out. Seems dumb but it doesn't really matter to my life.