Corvette throttle body

FlashBack · 08-28-2006, 11:23 PM

Joe (2005SSR6speed) , Now that you have my SSR running like a ---- ape. with the supercharger, I want more. What is your opinion on the effect of the corvette throttle body on the performance. Is it just seat of the pants, or is there some power to be had here. By the way, the other day , I disabled my supercharger temporarilly, and I can't believe how heavy the truck felt. It's not a slow ride stock to be sure, but back to back the difference is startling. Theres no going back now.

2005SSR6Speed · 08-29-2006, 08:52 AM

With the C6/GTO throttle body on a supercharged SSR it will need more fuel to cover the extra air the throttle body flows. Ask Hank "WildDesertWolf" what he thinks, we just did it to his 2 weeks ago.

matjow · 08-29-2006, 06:13 PM

Don't the 05 SSR, Vette and GTO all have the same 90 mm TB?

2005SSR6Speed · 08-29-2006, 08:58 PM

The C6/GTO and New Z06 have a different Throttle Body. The HP Tuner software still doesn't get the full blade movement but they are working on it. Even the way it is it still flows more air then the stock throttle body. I had to add more fuel when I installed mine on the SSR to compensate for the extra airflow. It is also more responsive then the stock throttle body. Best part is that it just bolts and plugs in in place of the stock throttle body. Below is a thread I did on the differences a while ago when I did the install on mine.

Eye Candy - Polished C6 90mm Throttle Body

matjow · 08-31-2006, 06:03 PM

What are the part numbers for

2005 Pontiac GTO throttle body

2005 Chevy SSR throttle body

2005 Chevy Corvette LS2 throttle body

2005SSR6Speed · 08-31-2006, 06:52 PM

Below is the part number for the LS2 GTO and C6 Corvette, this is also the same throttle Body for the LS7 Z06 Corvette.

Part: 12570790*
Category: Fuel Injection Air Meter Body
Description: BODY
Min.Qty: 1
Unit Price: $222.77
Quantity: 1
Ext.Price: $222.77
Core Charge: $0.00

The SSR and TBSS use the same throttle body, I dont have the part number on me.

matjow · 08-31-2006, 08:39 PM

I just purchased one of those Corvette throttle bodies.

Since it lets in more air, it's going to lean me out a little bit.

But, is it just a little lean - meaning it's still okay to drive until I find the time to get it re-tuned?

Or does it make it so lean that you should not drive it at all until it gets re-tuned?

MJJ

2005SSR6Speed · 08-31-2006, 08:45 PM

You can run scan with your HP Tuner. Talk with a member named Ross he has an automatic and is using the C6 throttle body. The tune will be a little different from the 6 speed. I have a good 6 speed tune for the throttle body and supercharger.

You can change the throttle body in the parking lot of the tuner in about 15-20 minutes.

I ran mine for a month before I tuned for it.

Ross · 08-31-2006, 11:12 PM

When using the vette/gto throttle body you should not have any problems at part throttle. WOT is a little lean and the PE needs to be enrichened. If you have a tuner with a wide band then the VE tables and MAF can be recalabrated to correct the A/F raito. The trans shifting (up/down) did not change.

JimGnitecki · 09-02-2006, 01:45 AM

I had recorded the following part number data when I started my 90mm throttle body project with 2005SSR6speed:

Stock GM throttle body on 04 SSR is pn 12588922 (replaces old pn 12573061) available for $133.10 from GMPartsDirect.com

Stock 05 SSR throttle body is pn 12572658 and costs $177 on GMPartsDirect.com

LS2 GTO / Corvette version of 90mm throttle body with actuator (same as LS7) = 12570790 and costs $235.38 at GMPartsDirect.com

Attachment seal for above LS2 GTO/Corvette throttle body is pn 12576549 and costs $14.xx on GMPartsDirect.com

Note carefully what 2005SSR6speed said about not getting full opening of the throttle body.

Those of ytou with 03/04 SSRs wanting to do this, do a search on "90mm" to trace the results and issues I have encountered. I am persevering, but there IS a mismatch between voltages for the throttle pedal, the TAC, and the throttle body, if you change to EITHER the 05/06 SSR throttle body or the GTO/Corvette throttle body. Call me if you need more info after FIRST reading my posts using search key "90mm".

Jim G

2005SSR6Speed · 09-02-2006, 09:54 AM

Jim - Thanks for the information.

matjow · 09-07-2006, 09:31 PM

It may be all in my head, but it appears to be a bit quicker off the line. It used to have just a smidge of hesitation off the line. But, no more.

MJJ

2005SSR6Speed · 09-07-2006, 09:43 PM

The ramp rates are a little fast for the new throttle body. I noticed a good bit of difference on the top end too.

JimGnitecki · 09-07-2006, 10:41 PM

Yes, the "feel" of the throttle system as a whole is affected by:

- The rate at which the accelerator pedal increases voltage with the distance it is moved

- the formula which the computer (or, on 03/04 SSRs, the separate Throttle Scutation Module or TAC) uses to translate pedal movement into throttle blae movement

- the rate at which the throttle body opens its blade as voltage increases.

When you replace the 05/06 SSR throttle body with the GTO / Corvette one, you change the relationship between pedal movement and blade movement.

On my own 04 SSR, when I went from the stock 76mm throttle body to the 90mm throttle body that 2005SSR6speed sent me (his old 05 SSR throttle body!), the relationship changed SO dramtically that, even with the correct TAC module from Speartech, each movement of the pedal results in more blade movement than before AND the "curve is weighted" with more blade movement per degree of pedal movement at the bEGINNING of the pedal stroke, and LESS blade movement as the pedal gets closer to full travel. It made my supercharged SSR feel even quicker than just the raw change in throttle body made.

However, it also requires me to use that custom "billet alloy" throttle stop, as full unrestricted movement of the pedal to full tarvel creates TOO high a volatge, that is interpreted by the computer as a "defect in throttle control", and the computer shuts the engine down to idle speed as a precaution!

Be careful when playing with making these changes. A combination like mine could be a terror on ice or snow, or even wet roads if the driver does not exercise good judgement and restraint.

Jim G

matjow · 09-08-2006, 07:58 AM

You are right. Speed is fun. But, it can also be dangerous. Safety is the priority.

MJJ

HD-Fatboy · 10-03-2006, 10:37 AM

Found this site with throttle bodies and they have an adapter for their GM LS2 90mm, maybe it's what you guys need?

http://www.corvettegarage.com/produc...-corvette.html

and this one,

http://www.lmperformance.com/7687/4.html

JimGnitecki · 10-03-2006, 01:46 PM

HD-Fatboy: These websites both are selling the same harness that we already have. The harness allows the throttle body to function,but results in the throttle body not opening fully (05/06 SSRs) or sending too high a voltage that causes engine protection mode (03/04 SSRs). THAT is the unresolved problem that needs a solution not yet found.

Jim G

HD-Fatboy · 10-03-2006, 04:08 PM

Okay, gotcha.

Has anyone looked at the circuit boards inside each throttle body? Couldn't the boards be swapped between the two if the electronics are the problem? They do nothing more than have an actuater inside that opens and closes the blade.

My bet is that there is a difference in what chip is on the board.

also this article from ls1tech.

http://www.ls1tech.com/forums/archiv.../t-200536.html

2005SSR6Speed · 10-03-2006, 05:59 PM

I know of 1 person that tried to swap the inner parts between the 2 and ended up with 2 expensive paperweights.

JimGnitecki · 10-03-2006, 06:58 PM

I am working on another possibility, and will post if successful.

Jim G