Sniper / EGR?

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weeegoneeer
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Sniper / EGR?

Postby weeegoneeer » Tue Oct 30, 2018 5:46 am

Hey all!

Thinking about getting a holley sniper, and was wondering if any of you are running EGR with it? Any problems / stuff to look out for?
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Stuka
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Re: Sniper / EGR?

Postby Stuka » Tue Oct 30, 2018 7:10 am

I guess it depends on how much swing the ECU has. The O2 sensor will detect the richer state when the EGR opens, which would then trigger the ECU to go leaner. As long as that falls in its window, it should be ok? But I do not have any first hand experience with it.
1981 J10 AMC 258 with HEI and Weber 32/36 DGEV Carb, T176, NP208, D44/M23 with 4.56 gears and Detroit Locker, 6" lift, 33x12.50 Cooper STT's, BJ's Offroad Rear Dozer Bumper.
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Pevious Jeeps: 1975 Cherokee, 2008 JK, 2005 KJ, 1989 XJ

weeegoneeer
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Re: Sniper / EGR?

Postby weeegoneeer » Fri Nov 02, 2018 11:31 pm

So, is EGR just not a thing with fuel injection? I could swear my 1st car ('84 Ford Tempo) had an EGR, and TBI. I like the idea of cooler temps in non-performance situations. But maybe I don't know what I'm talking about. About to order a manifold, and want to get the right one, which is why I'm asking.

Thanks all!
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Re: Sniper / EGR?

Postby Stuka » Sat Nov 03, 2018 6:19 pm

Every EFI car has EGR. But in those vehicles the ECU typically controls the EGR too. In our Jeeps the EGR is controlled by vacuum. The ECU should be able to adjust for the change in mixture. Was hoping somebody else here would speak up about using it. But like I said, you should be fine. Worst case is you just don't run vacuum to it.
1981 J10 AMC 258 with HEI and Weber 32/36 DGEV Carb, T176, NP208, D44/M23 with 4.56 gears and Detroit Locker, 6" lift, 33x12.50 Cooper STT's, BJ's Offroad Rear Dozer Bumper.
2017 JKU Rubicon Lifted and stuff
Pevious Jeeps: 1975 Cherokee, 2008 JK, 2005 KJ, 1989 XJ

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az chip
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Re: Sniper / EGR?

Postby az chip » Sat Nov 03, 2018 10:10 pm

Stuka wrote:Every EFI car has EGR. But in those vehicles the ECU typically controls the EGR too. In our Jeeps the EGR is controlled by vacuum. The ECU should be able to adjust for the change in mixture. Was hoping somebody else here would speak up about using it. But like I said, you should be fine. Worst case is you just don't run vacuum to it.


I'll let you know soon. I have EGR on a Eddy intake with a Sniper system.
'81 Cherokee Chief 81 WT Chief/MSD 6/ Rusty 4" Spring lift/ Bulltear oil adapter/K&P Engineering Oil Filter/ NP 208/ Serehill Light Harness/ H4 Headlights/ Evil Twin Fab Roof Rack and sliders/ Ross mirror mounts.

weeegoneeer
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Re: Sniper / EGR?

Postby weeegoneeer » Thu Nov 08, 2018 4:30 pm

Emailed Holley tech support and got the following answer. I honestly thought EGR keeps combustion temps DOWN?

Anyway, guess the Sniper wasn't designed to run w/EGR.


Thanks for contacting Holley Tech Support.

The Sniper is not designed to work with any kind of EGR system or be emission compliant. If you don''t need EGR for emissions i would recommend taking it off, it doesn''t do the motor any good to have the hot exhaust gases going back through the intake.

If you have any further questions, we can continue this email, or you can give us a call in Holley Technical Support, 270-781-9741 and any one of our techs can help you.

Thanks for choosing Holley Performance Products,
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Stuka
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Re: Sniper / EGR?

Postby Stuka » Fri Nov 09, 2018 7:22 am

Well, he is right that EGR routes exhaust through the intake. So that does heat the intake up. But it richens the mixture, which can help keep EGT's lower.

I get the feeling this guy is a lower tier support guy, and just knows the sniper isn't smog legal. I say give it a try. Worst case is you have to unplug the vacuum line and not use it.
1981 J10 AMC 258 with HEI and Weber 32/36 DGEV Carb, T176, NP208, D44/M23 with 4.56 gears and Detroit Locker, 6" lift, 33x12.50 Cooper STT's, BJ's Offroad Rear Dozer Bumper.
2017 JKU Rubicon Lifted and stuff
Pevious Jeeps: 1975 Cherokee, 2008 JK, 2005 KJ, 1989 XJ

weeegoneeer
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Re: Sniper / EGR?

Postby weeegoneeer » Tue Dec 11, 2018 7:09 pm

az chip wrote:I'll let you know soon. I have EGR on a Eddy intake with a Sniper system.


AZ - Wondering if you've been able to try it out? Am thinking I have a few weeks before machining is done.

Thanks!
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Re: Sniper / EGR?

Postby babywag » Tue Dec 11, 2018 8:10 pm

Stuka wrote:Well, he is right that EGR routes exhaust through the intake. So that does heat the intake up.
I get the feeling this guy is a lower tier support guy, and just knows the sniper isn't smog legal. I say give it a try. Worst case is you have to unplug the vacuum line and not use it.


Obviously tech not familiar w/AMC and the exhaust crossover either? That crossover in heads & intake heat crap out of the intake.
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az chip
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Re: Sniper / EGR?

Postby az chip » Thu Dec 13, 2018 1:06 am

weeegoneeer wrote:
az chip wrote:I'll let you know soon. I have EGR on a Eddy intake with a Sniper system.


AZ - Wondering if you've been able to try it out? Am thinking I have a few weeks before machining is done.

Thanks!


No. Working on Christmas. I work at fedex. I can tell you idle right now is an issue. I have fixed the large swing of AFR issues and high idle. After Christmas will be the testing/learning phase.
'81 Cherokee Chief 81 WT Chief/MSD 6/ Rusty 4" Spring lift/ Bulltear oil adapter/K&P Engineering Oil Filter/ NP 208/ Serehill Light Harness/ H4 Headlights/ Evil Twin Fab Roof Rack and sliders/ Ross mirror mounts.

weeegoneeer
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Re: Sniper / EGR?

Postby weeegoneeer » Fri Dec 14, 2018 8:44 am

Awesome - thanks for the update!
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weeegoneeer
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Re: Sniper / EGR?

Postby weeegoneeer » Sat Jan 19, 2019 6:02 pm

Wound up just getting the no EGR intake - too many variables. Still curious how it works out for you AZ!
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