Hi all,
I am going to be replacing my lifters this next weekend and of course checking my plenum gasket as i think it is leaking even with hughes repair kit. I was debating whether to think about buying the Hughes F1 airgap. My current motor is a 408 stroker and a mild hughes cam 208/214 512/520 114 . The online web site says it is for OBD 2 systems. I sent Hughes(Dave) a question if I could install it and of course he said yes, you just need tools. I expected him to respond better in answering the question as if it can be why do you have it works for OBD 2 system on your website. My 1995 is an OBD 1 system and I have an egr system. I did not remember if any of the EGR system ran into the back of the Kegger intake or not. Anyone able to answer if this will work on my year with the EGR system. I am not 100 percent going to buy it but seriously thinking about it. I think the stroker kit will help me override any supposed losses in the bottom end. Thanks for any help.
Rick

 

OBD2 PCMs can be modified with an updated tune. OBD1 PCMs are non-flashable and can't be updated. The EGR can be easily bypassed, but your bigger issue will be dealing with the OBD1 PCM and the modified 408 engine. Is the 408 engine in the truck now and running with the existing OBD1 PCM??

 

Hi Atomic dog. Yes, the 408 has been in my truck for at least 10 years and running strong. It has the Mopar PCM in it and of course is not up to its full potential but runs very well. I have another PCM that was tuned from BG performance with better tune on it but pulled it out as the gas prices were insane as the mileage. Dropped to about 8 or 9 being I was hot rodding it. It may be getting a standalone system at some time but just want it fixed for now. I am in Colorado so I Have to be careful of smog laws and passing inspection. Right now, it passes very well without any issues other than the Possible Plenum gasket of course will not make the smog happy.
But the main question I posted is will the airgap from Hughes bolt on being I have the EGR system. Does the back of the Intake have a port for the egr to hook into that the Hughes airgap cannot accommodate I believe correct. That is my question for now. I don't Plan on deleting the EGR for now. Unsure how much the delete would hurt emissions also and hate the fact of taking it off and putting it back on as the location suck to get to..
Thanks for responding.

 

Makes sense that its running well with the MOPAR Performance PCM or a modified B&G Performance PCM. I don't have a Hughes AirGap manifold, but I suspect that it wasn't made to support EGR. Mopar Performance supports EGR for a short period with their M1 intakes (as I have an M1 2 barrel with EGR), but when I end up using it, I'll block off the EGR provision, as I'm running JBA coated shorty headers that don't have any EGR provisions.

Just as an FYI, you could bolt on later model 5.2/5.9 exhaust manifolds or headers and do away with the EGR provisions. I doubt if EGR is doing much for you with the 408 motor..

 

Hey Dog,
So you were still able to get your hands on the M1 with egr setup. I looked at it in the past but never bought the setup as I was afraid of losing any torque down low. It seems the consensus overall that you would lose down low, and it is really a manifold maid for top end. I don't really drive it hard anymore but definitely did not want to lose any torque down low. I have 285 tires on and 4.56 gears so i definitely am able to make up power with the gears and not bad withe overdrive of keeping the rpm's down still. The price of the M1 started climbing as they started to go out of production i noticed. So, they are worth some money if you ever want to sell it. Like all parts that they don't make any more if someone wants it they might have to pay a lot if the person who has it does not want to let go of the part cheap.
Like I said I am not sure if the EGR deleted would be able to pass emissions or not only way is to try it and see if it passes without it. If not then put it back on. Just pain in the *** as it is way in the back of the engine and hard to get to. If I did not have to do emssions i would think of it.

 

The M1 2 bbl was still a dual plane manifold, so, while yes, you did lose a bit of torque down low, the engine would be much happier about revving.... it could breath a lot better. The M1 4bbl on the other hand, is a single plane intake, and low end torque takes a beating with that one. Of course, you are compensating with more cubes. You may not even notice.

If you wanted to do tuning on your truck, just get a pcm and wiring harness from a 96 or 97 truck. It's pretty much a direct swap, except for..... the trans. 95-96 is the break point for RH to RE transmissions.....

 

Yes I read about doing the harness swap and basically turning it into a OBD2 system. There is actually a guy on the e-coat who will take your harness and male it work even with a 46rh tranny still in it. You still have to get the OBD 2 harness, and he makes it all happen. This is a lot of work. I might see about a standalone system. I read some of them need a return system to the gas tank unfortunately for the popular systems, but I have not talked to tech support about it just read about each systems requirement. My friend is a really good mechanic, and he works on all vehicles and is a Mopar man plus a big Hellcat mechanic and tuner. He said he would look into if it was possible. But I am sure it is not cheap. But is anything cheap now a days.

 

Yes, I got lucky and found the M1 intake with EGR provision on my local Craigslist several years ago. Guy sold it to me for $200, along with the adapter bolt kit, stock throttle body and a few other miscellaneous parts. Back then, those intakes weren't hot seller, since folks felt that the low end was lacking. In addition, this is a Chevy & Ford area. Dodge parts tended to sit back then and in some cases, still do now.

 

In 96 the egr was gone, I don't think removing it will effect the way they test emissions. EGR valve will be closed at idle regardless. With the pcm you are using i would think it's disabled anyway. You can get the LA style heads that fit the magnum and that will allow you to run any manifold you want that was made for the LA motors. Many people mod the kegger and claim it boost's hp but at what rpm? According to the dyno results on their web site the stock kegger produces more hp than them all up to about 4K. Is it worth spending the $ to gain some hp in the upper rpm band? That's what you have to ask yourself.
http://www.hughesengines.com/Upload/...ynocompare.pdf

 

LA motors use an entirely different valve train, and it is also lubed different..... Not sure I would want to try and use LA heads on a magnum motor...... You can get manifolds drilled for either style of heads though.