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Old 11-14-2012, 03:29 PM   #1
ace32x
 
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zl1 throttle body restrictive?

car is currently stock. but im throwing a rotafab intake on my m6 zl1 as soon as i recieve it and was wondering if the stock throttle body had any gains to be had by replacing it with a nw 102? for now im not modding to heavily but down the road i will be doing a cam and valve springs and heat exchanger/pump and headers so it will eventually be needed.

was just curious if the money was worth it now to pick one up to combo with the intake
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Old 11-14-2012, 04:36 PM   #2
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assume a TB would probably need a ported snout aswell to get full benefit
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Old 11-14-2012, 07:10 PM   #3
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The 90mm LS3 throttle body is suppose to give an increase of 14HP without anything other than bolting it up. GM part number 12605109. The stock ZL1 throttle body is 85 or 87mm so the 90mm is about a 10% increase in open area. About $140 to $150 from GM parts house, Parts Taxi or GM parts Direct.
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Old 11-14-2012, 07:16 PM   #4
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The 90mm LS3 throttle body is suppose to give an increase of 14HP without anything other than bolting it up. GM part number 12605109. The stock ZL1 throttle body is 85 or 87mm so the 90mm is about a 10% increase in open area. About $140 to $150 from GM parts house, Parts Taxi or GM parts Direct.
Are you saying the zl1 has a smaller t-body than the ls3?
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Old 11-14-2012, 07:21 PM   #5
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Yes, ZL1 10% smaller area. CTSVs have the same smaller throttle body and respond very well to the 90mm LS3 throttle body. No porting necessary.
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Old 11-14-2012, 07:37 PM   #6
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Might aswell just get the Nw 102 if I'm going to go bigger
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Old 11-14-2012, 09:05 PM   #7
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Is there any other wiring harnesses needed with the 90 mm?
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Old 11-14-2012, 09:14 PM   #8
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Might aswell just get the Nw 102 if I'm going to go bigger
The 102 is bigger than the snout opening so you won't gain anything without porting, plus the 102 is over $500.

The LS3 plugs right into the existing connector and matches the stock port opening. Plug and play $140.
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Old 11-14-2012, 09:28 PM   #9
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The 102 is bigger than the snout opening so you won't gain anything without porting, plus the 102 is over $500.

The LS3 plugs right into the existing connector and matches the stock port opening. Plug and play $140.
I eventually plan on porting the snout anyways so may just do it all at once. Itl be getting a cam and pulley down and heat exchanger and some other stuff in the near future anyways
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Old 11-15-2012, 03:57 AM   #10
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What TB does the ZR1 Corvette have?
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Old 11-15-2012, 09:28 AM   #11
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The 90mm LS3 throttle body is suppose to give an increase of 14HP without anything other than bolting it up. GM part number 12605109. The stock ZL1 throttle body is 85 or 87mm so the 90mm is about a 10% increase in open area. About $140 to $150 from GM parts house, Parts Taxi or GM parts Direct.

So if you added the no tune CAI and a 90mm TB would you need a tune? I assume yes with all the extra air flow
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Old 11-15-2012, 09:51 AM   #12
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You shouldn't since its still less than running an od pulley
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Old 11-15-2012, 10:11 AM   #13
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You shouldn't since its still less than running an od pulley
good point. I am definitely getting a no tune CAI. I will probably get a pully but do not want to tune the car yet. JRE has some great results. I am thinking the CAI and 90MM TB to start and then can add pulley etc with or without a tune when I want. Still want to retain the factory warrentee at this point. A CAI and TB is a pretty cheap upgrade which can be utilized with any future mods.
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Old 11-15-2012, 10:36 AM   #14
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good point. I am definitely getting a no tune CAI. I will probably get a pully but do not want to tune the car yet. JRE has some great results. I am thinking the CAI and 90MM TB to start and then can add pulley etc with or without a tune when I want. Still want to retain the factory warrentee at this point. A CAI and TB is a pretty cheap upgrade which can be utilized with any future mods.
thats what i was thinking aswell. i dont want to buy 2 TBs tho which is why im leaning twords a 102, but on the other hand i dont want to pull the snout off yet either. Wondering what the gains would be with a 102 with a stock snout
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Old 11-15-2012, 02:14 PM   #15
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So if you added the no tune CAI and a 90mm TB would you need a tune? I assume yes with all the extra air flow
The MAF is reading airflow and should compensate without a tune.
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Old 11-15-2012, 02:18 PM   #16
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The MAF is reading airflow and should compensate without a tune.
Was talking in pm to Ted this morning and he said we wouldn't be able to run a bigger tb with our a tune after all ):
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Old 11-15-2012, 08:40 PM   #17
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he stated in another thread that the TB and cold air together would require tune. just the TB alone though has been doen without tune.

I want pulley, cai, tb so I will have to tune.
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Old 11-15-2012, 08:53 PM   #18
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I have the cai already so that would require a tune then. Thinking of doing the 9.1" and put some torco in
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Old 11-16-2012, 10:27 AM   #19
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ace32x,

The 102 has had some driveability issues I believe. The 90 is OEM reliability.
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Old 11-16-2012, 11:01 AM   #20
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ace32x,

The 102 has had some driveability issues I believe. The 90 is OEM reliability.
i have a 102 on my stroked ls1 in my 240sx and have never had a problem with it
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Old 11-22-2012, 06:58 AM   #21
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We have proved time and time again with valid data that anything above 10psi the stock TB becomes a major restriction and anything above 13psi the requirement of a 102mm TB is really necessary to prevent major airflow restrictions. The 102mm TB is worth about 2psi from 3700rpm and up at the 600-650+RWHP mark translating in much higher HP and a broader power curve

We keep these in stock in BLACK or Natural

We have zero driveability issues with the cars we tune, but many adjustments need to be made for this TB. The throttle response alone is worth it
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Old 11-22-2012, 10:11 AM   #22
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The 90 works great IF tuned for it....but it is not a plug and play.

The 87mm VMax CNC patteren ported makes a very noticable difference though and that is a direct swap.

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Old 11-29-2012, 10:41 PM   #23
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Yep, you CAN NOT just swap the tb and go with it. It has to be tuned properly. Although many do mods and don't tune, which IMHO, is not getting your monies worth out of the parts.
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Old 11-30-2012, 10:58 AM   #24
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Quote:
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thats what i was thinking aswell. i dont want to buy 2 TBs tho which is why im leaning twords a 102, but on the other hand i dont want to pull the snout off yet either. Wondering what the gains would be with a 102 with a stock snout

nothing
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Old 11-30-2012, 11:01 AM   #25
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nothing
weve gathered that now. going to port the snout and pick up a 102 and tune it here in the spring. running a roto fab a 9.1" pulley and torco currently, will be good enough until i can get some LT's test pipes the TB and ported snout and tune it
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