Holley stealth ram wont rev past 4000 rpm
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Joined: May 2011
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From: New Bedford MA
Car: 1988 Gta trans am
Engine: LR4 4.8
Transmission: 98-02 t56 6 speed
Axle/Gears: Bw 9 bolt (3.70’s) pbr rotors
Holley stealth ram wont rev past 4000 rpm
ok everyone got a stealth ram installed on my afr heads. When i had the tpi on it ran like a bat outta hell now when i put this intake on it wants to bog pass 4000 rpm what the hell can be wrong ???? Fuel pressure is set at 43 psi. The way i have my lines ran is the main fuel line supplying the rails then coming out the rail to a aeromotive regulator going back to the tank is this way correct to run or did i mess it up. Timing is set at 6 degrees btdc with the by pass unhooked starts right up no problem but wont go past 4000 rpm any help will greatly appreciated
Joined: Feb 2001
Posts: 8,494
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From: Sophia, NC
Car: 2016 Camaro SS + 1986 Z28
Re: Holley stealth ram wont rev past 4000 rpm
Do you have an wideband? ....if not, can you physically SEE fuel pressure during a WOT run? -not simulated by pulling the vacuum line, but during actual driving? Nothing else should be different, right? Other than a big ole air box ya bolted on, it's all the same, other than the fuel lines and reg, right? Unless it's something dumb, i'm thinking something with the fuel. Anyway to hook up a gauge with a hose and tape it to the windshield?
Edit...not sure how you test pressure with that regulator, but idle should be closer to 35....WOT around 43. ....still, not sure how that would restrict your rpms.
How does it drive up until 4000?
Edit...not sure how you test pressure with that regulator, but idle should be closer to 35....WOT around 43. ....still, not sure how that would restrict your rpms.
How does it drive up until 4000?
Last edited by Abubaca; Dec 2, 2018 at 08:21 PM.
Thread Starter
Senior Member
Joined: May 2011
Posts: 855
Likes: 1
From: New Bedford MA
Car: 1988 Gta trans am
Engine: LR4 4.8
Transmission: 98-02 t56 6 speed
Axle/Gears: Bw 9 bolt (3.70’s) pbr rotors
Re: Holley stealth ram wont rev past 4000 rpm
this how i have my fuel plumbing set up on my hsr is this not correct way to run it ?
Thread Starter
Senior Member
Joined: May 2011
Posts: 855
Likes: 1
From: New Bedford MA
Car: 1988 Gta trans am
Engine: LR4 4.8
Transmission: 98-02 t56 6 speed
Axle/Gears: Bw 9 bolt (3.70’s) pbr rotors
Re: Holley stealth ram wont rev past 4000 rpm
Do you have an wideband? ....if not, can you physically SEE fuel pressure during a WOT run? -not simulated by pulling the vacuum line, but during actual driving? Nothing else should be different, right? Other than a big ole air box ya bolted on, it's all the same, other than the fuel lines and reg, right? Unless it's something dumb, i'm thinking something with the fuel. Anyway to hook up a gauge with a hose and tape it to the windshield?
Edit...not sure how you test pressure with that regulator, but idle should be closer to 35....WOT around 43. ....still, not sure how that would restrict your rpms.
How does it drive up until 4000?
Edit...not sure how you test pressure with that regulator, but idle should be closer to 35....WOT around 43. ....still, not sure how that would restrict your rpms.
How does it drive up until 4000?
Joined: Sep 2003
Posts: 25,895
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From: Pittsburgh PA
Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: MWC 9” 3.00
Re: Holley stealth ram wont rev past 4000 rpm
How old is the ignition module?
What spark plugs are in it?
fuel rail route is fine. In one, cross over to other, out to regulator then back to tank
wideband will show fueling thru the pull. Or get a scan aldl cable and tunerpro rt. Take readings
What spark plugs are in it?
fuel rail route is fine. In one, cross over to other, out to regulator then back to tank
wideband will show fueling thru the pull. Or get a scan aldl cable and tunerpro rt. Take readings
Thread Starter
Senior Member
Joined: May 2011
Posts: 855
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From: New Bedford MA
Car: 1988 Gta trans am
Engine: LR4 4.8
Transmission: 98-02 t56 6 speed
Axle/Gears: Bw 9 bolt (3.70’s) pbr rotors
Re: Holley stealth ram wont rev past 4000 rpm
Ignition module is fairly new i replaced it with a new gm ac delco module and as well added the white lithium grease to the bottom. Im just really stumbed on thos had the same problem with my vortec hsr as well
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Joined: Feb 2001
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From: Sophia, NC
Car: 2016 Camaro SS + 1986 Z28
Re: Holley stealth ram wont rev past 4000 rpm
That white stuff isn't white lithium grease. It's a heat resistant, non conductive paste. When they do go, they typically won't start, but still....might not be a bad idea to get the right stuff on there. Heard guys say you could get it at Best Buy or other computer/electronic places. Mine have always come with a little and I just left it as is.
Thread Starter
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Joined: May 2011
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From: New Bedford MA
Car: 1988 Gta trans am
Engine: LR4 4.8
Transmission: 98-02 t56 6 speed
Axle/Gears: Bw 9 bolt (3.70’s) pbr rotors
Re: Holley stealth ram wont rev past 4000 rpm
It was whatever came with the module i always thought it was white grease but i was wrong. Im getting in contact with scott hansen he does chip burning for these kind of builds big tpi guru he is. Hopefully it will run correctly with this i just dont understand how i went from a running strong tpi intake to this sweet intake and now its giving headaches. Im going to try the timing at 8 btdc and see if this changes anything or do you think i should just drop it in at 0 and see what happens. This is all on the stock tune though 5.7 tpi mass air flow auto. Even though im using a 5.7 tpi mass air flow with t5 it should still be able to run up to 5000-5500 rpm.
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Joined: May 2005
Posts: 1,057
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From: Malvern, Arkansas
Car: 90 IROC 2-92 Zs blk vert & prpl
Engine: stealth ram brodix track 1 ful port
Transmission: 700r4 4l80e
Axle/Gears: iroc 375 lokr 92 Z 277 pos vert 327
Re: Holley stealth ram wont rev past 4000 rpm
I had a regulator problem and had to get an aftermarket regulator. But mine goes past 6 easy but it's been welded and ported a little past 1206 to a set of ported brodix track 1s. Everybody talks about afr and a few other cylinder heads but brodix knows there business. Have it port matched and get a good regulator and it can make over 400 RWH and be perfectly street driveable. Mine flowed about 310 through the entire setup bolted together. The power is there with a stealth ram along with rpm you just have to add material to the port where it joins the head and open up the top and short side of the port.
Joined: Sep 2003
Posts: 25,895
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From: Pittsburgh PA
Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: MWC 9” 3.00
Re: Holley stealth ram wont rev past 4000 rpm
It was whatever came with the module i always thought it was white grease but i was wrong. Im getting in contact with scott hansen he does chip burning for these kind of builds big tpi guru he is. Hopefully it will run correctly with this i just dont understand how i went from a running strong tpi intake to this sweet intake and now its giving headaches. Im going to try the timing at 8 btdc and see if this changes anything or do you think i should just drop it in at 0 and see what happens. This is all on the stock tune though 5.7 tpi mass air flow auto. Even though im using a 5.7 tpi mass air flow with t5 it should still be able to run up to 5000-5500 rpm.
Stock maf system will run a stealth ram just fine to 6000 rpm, you dont need a chip although there is some power to be had. Ran fine before and runs to 4000, something is screwing up
Joined: Aug 2015
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From: Salt Lake City. UT
Car: '92 RS
Engine: 5.0TBI
Transmission: TKX
Axle/Gears: 2.73
Re: Holley stealth ram wont rev past 4000 rpm
My Chev truck did this when it had a clogged fuel filter. I'd check for supply side restrictions. Filter, kinked hose, inadequate fuel pump. Good luck with the TS.
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Joined: Aug 2008
Posts: 172
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Car: 88 gta
Engine: 5.8
Transmission: 700R4
Axle/Gears: 3.73 POSI
Re: Holley stealth ram wont rev past 4000 rpm
When u say its falling on its face do u mean its breaking up?almost sounds like a fuel pump problem could be a pump,fuel filter or fuel reg.how is it idleing?
Thread Starter
Senior Member
Joined: May 2011
Posts: 855
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From: New Bedford MA
Car: 1988 Gta trans am
Engine: LR4 4.8
Transmission: 98-02 t56 6 speed
Axle/Gears: Bw 9 bolt (3.70’s) pbr rotors
Re: Holley stealth ram wont rev past 4000 rpm
It idles just fine right at 700-750 rpm nice and smooth will rev up with no problem. The fuel pump and regulator are brand new walbro255 pump and aeromotive external regulator so i doubt those are the problem. Fuel filter i will install a new one since it is only 8-10 bucks and takes 2 minutes to change but doubt that is the problem.
Joined: Feb 2001
Posts: 8,494
Likes: 412
From: Sophia, NC
Car: 2016 Camaro SS + 1986 Z28
Re: Holley stealth ram wont rev past 4000 rpm
I agree that it doesn't make sense that it's fuel related, being that all those parts are new. -but it also doesn't make sense that it's NOT fuel related, being that it's just a manifold change and fuel rails. Point is that ya gotta double down and check everything.
I still think ya gotta see what's going on while driving. A wideband is ideal, but even confirming your fuel pressure while driving would shed some light.
I still think ya gotta see what's going on while driving. A wideband is ideal, but even confirming your fuel pressure while driving would shed some light.
Thread Starter
Senior Member
Joined: May 2011
Posts: 855
Likes: 1
From: New Bedford MA
Car: 1988 Gta trans am
Engine: LR4 4.8
Transmission: 98-02 t56 6 speed
Axle/Gears: Bw 9 bolt (3.70’s) pbr rotors
Re: Holley stealth ram wont rev past 4000 rpm
Ok here is a update so i pulled the intake off and valve covers to see how things look with the valvetrain. I actually saw a few weird looking retainers sitting by the lifters 🤔🤔🤔🤔 look like the retainers that hold the internal pieces of the lifter together. Did i not preload the lifters enough? i was told go zero lash and thats it on the flat part of the cam then go on to the next cylinder and do the same. Could any damage be done to the cam after finding these retainers? Hoping not cause the cam and lifter combo wasn’t cheap. People told me that it could create a flat spot on the lobe’s of the cam when that happens
Joined: Sep 2003
Posts: 25,895
Likes: 429
From: Pittsburgh PA
Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: MWC 9” 3.00
Re: Holley stealth ram wont rev past 4000 rpm
Yikes never seen that before! Definitely want to pull it apart and inspect lifters and cam lobe
I always set preload using intake closing exhaust opening method. Ensure the lifter is on the base circle
I always set preload using intake closing exhaust opening method. Ensure the lifter is on the base circle
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