New injectors for L98?
Thread Starter
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Thanks, I'm now running ~50psi with stock injectors and building ~300chp when she's running well, so I have some headroom to drop fuel pressure with the 25lb/hr injectors. And, since I don't plan to build up my L98 to over 400chp these injectors should serve well in the future.
Since Dough assured me there was no fitment problem on his '85 Vette I just placed the order with SLP for a set of the LS1 pulls (23051).
I'll post up results of the installation on my L98.
Thanks much for the helpfull input eveyone.
Since Dough assured me there was no fitment problem on his '85 Vette I just placed the order with SLP for a set of the LS1 pulls (23051).
I'll post up results of the installation on my L98.
Thanks much for the helpfull input eveyone.
Instructor
Joined: Feb 2005
Posts: 192
Likes: 1
From: Western Washington State
Cruise-In VII Veteran
This is exactly the kind of good stuff I come to this forum for. 
I'll be anxiously awaiting 65Z01's report
- at that price I'm tempted to buy the SLP takeoffs just on principle.
I'll be anxiously awaiting 65Z01's report
- at that price I'm tempted to buy the SLP takeoffs just on principle.
Thread Starter
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
I just got a call from Joey at SLP saying that those injectors would not fit my '88 TPI so they were canceling the order and not charging my card.
When I returned the call he did say that some machining would be necessary and that some guys experienced with TPI are using them.
Finally we agreed that he would ship them on a no return basis and that I should have them in about 5 days.
For sure I'll post up my findings when I know whether I install them or put em up for sale on the C4 Forum.
When I returned the call he did say that some machining would be necessary and that some guys experienced with TPI are using them.
Finally we agreed that he would ship them on a no return basis and that I should have them in about 5 days.
For sure I'll post up my findings when I know whether I install them or put em up for sale on the C4 Forum.
Intermediate
Joined: Oct 2004
Posts: 30
Likes: 0
From: Canon City CO
Originally Posted by 65Z01
bark3711, unless you are having fuel delivery or leaking problems there is no reason to "upgrade" from your stock injectors with only minor mods. It is better to install an AFPR and adjust fuel pressure for optimum fuel delivery at WOT.
Le Mans Master
Joined: Feb 2003
Posts: 9,087
Likes: 0
From: Chicago IL
I ran ADS 24# matched injectors in my L98. I think it was over kill and should have gone with 22# and cranked up the fuel pressure to 45-50psi.
New injector sets are cheap enough that there is no reason to buy used injectors.
New injector sets are cheap enough that there is no reason to buy used injectors.
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Thread Starter
Team Owner
Joined: Dec 2000
Posts: 90,675
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From: SE NY
Cruise-In II Veteran
My understanding is that these are new injectors taken off a new engine to be replaced with (assumed ) larger ones.
JIMBO7, my understanding is that's all that is required to fit them to a TPI but Joey said something about using the "lower groove" though I only see one clip groove in their pic of the injector set.
Anyway, I just received notice that the set shipped from SLP, so tomorrow I'll check with UPS tracking to see where they are. If they come in Fri. and check out ok against an old stock injector I may try to get them in that night before the Corvette Challenge on Sat. morning.
JIMBO7, my understanding is that's all that is required to fit them to a TPI but Joey said something about using the "lower groove" though I only see one clip groove in their pic of the injector set.
Anyway, I just received notice that the set shipped from SLP, so tomorrow I'll check with UPS tracking to see where they are. If they come in Fri. and check out ok against an old stock injector I may try to get them in that night before the Corvette Challenge on Sat. morning.
Thread Starter
Team Owner
Joined: Dec 2000
Posts: 90,675
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From: SE NY
Cruise-In II Veteran
I thought they looked narrower (not surprising with newer technology) so I couldn't tell if they were taller or not.
Hopefully they will still fit under the fuel rail.
Hopefully they will still fit under the fuel rail.
Instructor
Joined: Dec 1999
Posts: 161
Likes: 0
From: Atlanta Ga
FWIW<
The Ford"24#" dont flow 24 @ 43.5 PSI,its more like 22.9,when I had mine checked,with an adjustable FPR you can dial them in pretty close without a retune.However they are bosch pintle style so they are more prone to clog.
I have had excellent results with the LT1,motecs,they didnt clog even after 80K in My Impala SS,they are designated 24# ,but flow between 25-26,they are too big for a stock l98, but work fine on my 406,
and they dont leak or clog like my 85 ccorvette bosch 223',s did.
The Ford"24#" dont flow 24 @ 43.5 PSI,its more like 22.9,when I had mine checked,with an adjustable FPR you can dial them in pretty close without a retune.However they are bosch pintle style so they are more prone to clog.
I have had excellent results with the LT1,motecs,they didnt clog even after 80K in My Impala SS,they are designated 24# ,but flow between 25-26,they are too big for a stock l98, but work fine on my 406,
and they dont leak or clog like my 85 ccorvette bosch 223',s did.
Thread Starter
Team Owner
Joined: Dec 2000
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From: SE NY
Cruise-In II Veteran
Well the set of pulls just arrived on the "brown truck" from SLP.
I thought I could lay hands on the old stock set but NADA, so I'll have to pull the fuel rail on the Vette so I can compare injectors.
As advertised these pulls do not have the clip groove fully around but it does not look like a major effort to fix with a cutoff wheel on my Dremel.
I'll post how they match up against the stock injectors dimension wise and will take some close up pics of them before & after machining.
I thought I could lay hands on the old stock set but NADA, so I'll have to pull the fuel rail on the Vette so I can compare injectors.
As advertised these pulls do not have the clip groove fully around but it does not look like a major effort to fix with a cutoff wheel on my Dremel.
I'll post how they match up against the stock injectors dimension wise and will take some close up pics of them before & after machining.
Drifting
Joined: Aug 2004
Posts: 1,400
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From: Oceansaide CA
Originally Posted by mos90
they are no good over 400 fwhp.
65z01, I'm all ears on this one
Just replaced a multech with the same (it was shorting out) just to kill some time while I find a good deal..
If you keep up on this thread and fill in all the details that would definitely be good reading..
Thread Starter
Team Owner
Joined: Dec 2000
Posts: 90,675
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From: SE NY
Cruise-In II Veteran
Damn, from clip groove to lower O-ring on the stock injectors is 60mm; on the SLP pulls it is only 55mm!!
I'm not sure if they will seal in the intake base with the lower O-ring 5mm higher in the bore???
How long are the Ford injectors by comparison to our stock units??
I'm not sure if they will seal in the intake base with the lower O-ring 5mm higher in the bore???
How long are the Ford injectors by comparison to our stock units??
Racer
Joined: May 2004
Posts: 476
Likes: 0
From: DFW TX
You may have to grind down the fuel rail boss's on the manifold so they seat down better. I put the LS1 injectors in my LT1 with only having to dremel out the clip groove and they work great. I'm also thinking of using them in my L98. Let me know how it works out for you.
Melting Slicks
Joined: Mar 2004
Posts: 2,141
Likes: 2
From: Pittsburgh Pa
i got the slp injectors in my lt1 manifold for my camaro and they just barely fit in there. didn't bother with the clips. they work fine. they are just a hair shorter than a set of 305 tpi injectors that i had laying around.
as far as the one dude saying that 24#ers are no good for over 400fwhp. three people have posted saying they are running 19# injectors on 500+ hp motors. good enough for stock i would guess.
i was thinking of using them on a tpi so let us know what is going on. if they don't work i may just buy a stealth ram and a new set of those injectors.
as far as the one dude saying that 24#ers are no good for over 400fwhp. three people have posted saying they are running 19# injectors on 500+ hp motors. good enough for stock i would guess.
i was thinking of using them on a tpi so let us know what is going on. if they don't work i may just buy a stealth ram and a new set of those injectors.
Thread Starter
Team Owner
Joined: Dec 2000
Posts: 90,675
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From: SE NY
Cruise-In II Veteran
I noticed that the stock injectors sit rather high in the fuel rail which has a deep hole for the O-ring.
Sooo, I cut the retainer clip ring about 1-2mm higher on the SLPs than the current partial clip ring. This will allow them to ride a little lower in the rail (and so a little deeper in the base) yet the clips will prevent them from blowing out.
The job isn't too bad, maybe 1hr with a cut off wheel on a Dremel and a finger nail file to touch up the groove.
I just installed the fuel rail and lines. Hmmm, the lower O-rings are a riding just at the bottom of the taper in the base. We'll see how she runs tomorrow.
BTW, I snapped off a copla pics of before & after with a pull next to a stock injector. I'll put em up later.
Sooo, I cut the retainer clip ring about 1-2mm higher on the SLPs than the current partial clip ring. This will allow them to ride a little lower in the rail (and so a little deeper in the base) yet the clips will prevent them from blowing out.
The job isn't too bad, maybe 1hr with a cut off wheel on a Dremel and a finger nail file to touch up the groove.
I just installed the fuel rail and lines. Hmmm, the lower O-rings are a riding just at the bottom of the taper in the base. We'll see how she runs tomorrow.
BTW, I snapped off a copla pics of before & after with a pull next to a stock injector. I'll put em up later.
Last edited by 65Z01; May 5, 2005 at 08:30 PM.