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-   -   99 Sub 5.3 - FAST LSXRT 102 : Injectors question (https://www.performancetrucks.net/forums/gm-engine-exhaust-performance-21/99-sub-5-3-fast-lsxrt-102-injectors-question-471182/)

Brice Oct 23, 2010 10:23 AM

99 Sub 5.3 - FAST LSXRT 102 : Injectors question
 
My friend is currently installing his new Fast Intake Manifold LSXRT 102 with a Nick Williams 92 TB on this H/C Suburban 5.3.

He told me his injectors doesn't fit (EV1 LS1 style Injectors). (the injector hole on the intake )is too small).
So I've send him my Ford Red Devil #36 injectors (SVO #30).
He's just phoned me : they didn't fit !
I was reading the Fast Web Site : they say that the stock injectors fit but they Requires injector lower o-ring swap when using OEM injectors (included with manifold).

What's that means exactly ? My friend need to modify the injector ?

Need help !

Three6GMC Oct 23, 2010 11:14 AM

no it just means he needs to swap the lower o ring out for a thinner one... The kit should include the smaller ones just change the factory ones out for the ones in the kit and they should fit

Brice Oct 23, 2010 12:25 PM


Originally Posted by Three6GMC (Post 4564726)
no it just means he needs to swap the lower o ring out for a thinner one... The kit should include the smaller ones just change the factory ones out for the ones in the kit and they should fit

That's what I thought ... but ... no ...
Stock Injectors :
http://i29.servimg.com/u/f29/15/59/14/24/dsc_1525.jpg
http://i29.servimg.com/u/f29/15/59/14/24/dsc_1527.jpg

He told me the SVO #30 'Red Devil' didn't fit at all. (I'm waiting for the pics):bang:

Brice Oct 23, 2010 01:06 PM

Here are the pix !
The Intake hole is 11mm, the injector is 13mm

http://i29.servimg.com/u/f29/15/59/14/24/dsc_1534.jpg

http://i29.servimg.com/u/f29/15/59/14/24/dsc_1536.jpg

Here is problem : The littler hole is 11mm (from under), the injector (with or without the o-ring) didn't fit ! (as the injector bottom is 13mm)
http://i29.servimg.com/u/f29/15/59/14/24/dsc_1539.jpg

Any idea?

2004SSS Oct 23, 2010 02:11 PM

odd , can you find anyone with the same manifold? most injectors that any lsx uses are the same size. i wonder if the injector holes didnt get finished.

those do look like they are in far enough though maybe you just need a larger o ring to make them fit . do you have a pic of the bottom of the intake with the injector in place?

Brice Oct 24, 2010 07:26 AM

more pix.

Stock intake with stock injectors:
http://i29.servimg.com/u/f29/15/59/14/24/dsc_1541.jpg

Fast LSXRT and stock injectors: (is the normal that the injector is sooooo far from the bottom of the intake)
The inner hole is too tight, the injector doesn't fit

http://i29.servimg.com/u/f29/15/59/14/24/dsc_1542.jpg
http://i29.servimg.com/u/f29/15/59/14/24/dsc_1545.jpg

Brice Nov 30, 2010 04:37 AM

Some news : The problem is solved.
I've ordered LS2 Injectors and Adapter. (Thanx Ron@vengeance)

They fit perfectly !
http://i69.servimg.com/u/f69/15/59/14/24/dsc_1627.jpg
http://i69.servimg.com/u/f69/15/59/14/24/dsc_1628.jpg

LS2 vs stock
http://i69.servimg.com/u/f69/15/59/14/24/dsc_1629.jpg

Here is a video of the start up :
http://www.youtube.com/watch?v=3vpGp...layer_embedded

Wheatley Nov 30, 2010 04:59 AM

Good question?I am doing this on my Lq4.Manifold is on,I am having to adjust the brackets a touch
I am running my stock rails with brand new multech II flow matched injectors.
Hopefully I did not spend 500.00 on these injectors for them not to fit.LOL Damn.

fohovlegotz Feb 23, 2015 08:24 PM

Sorry to resurrect this thread but I'm running into the same issue. Did you need to adjust the tune for the ls2 injectors or do they swap right in?

batboy Feb 23, 2015 09:11 PM

Swapping in different injectors require a retune.


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