Fuel Pressure regulators for 1G turbos

[2-0turbo]

Do you have a high flow aftermarket pump and need an aftermarket regulator on your 1G? If you are running a Walbro 255/255HP or Supra pump, you do. These high flow pumps flow too much fuel at idle for the stock regulator to handle.

MY RX7 buddy made a bunch of these adapters last year and is making another run of them. I have one on my car with an Aeromotive regulator (-06 AN) and Supra pump and it works well. The adapters are available shipped for $58 (just the aluminum piece) or everything you see in the picture for $275 shipped. Simply take your stock regulator off, remove the O'ring and transfer to this adapter and bolt the thing up. Set your base fuel pressure and you are ready to go. Let me know. He is making a run of 20 right now, 6 are already spoken for. Contact Greg for info. Ready to ship in about 2 weeks.

 

[NJGSX96]

Wow that looks nice. Looks like the SX regulator my friend has.

 

[Formz]

You do NOT always need an aftermarket FPR when running a 255 or supra pump. There are literally hundreds of DSMers running aroudn with the stock FPR, a Walbro 255 and NO problems whatsoever. I am one of them. Usually, the only time people have problems is when they rewire the walbro, but on the stock wiring the walbro is fine.

 

[umiami80]

You do NOT always need an aftermarket FPR when running a 255 or supra pump.

Wrong, check your base FP and I guarantee it is above 50 when it shouldb be infact below 40. Can you get away with it with a SAFC, sure, but your tuning curve will be all messed up and your spoolup will never be as good as it should. I guarante that if you get a FPR and turn down the base fuel Pressure, you will see better gas milage, better idel, way better spoolup, drivability, less or no stalling, and you won't faul up your plugs. Check out www.dsmtalk.com and search on this subject that has been beaten to death almost as much as venting into the atmosphere. For proper fuel management, you need a FPR to turn down the base fuel pressure, your stock one is over run, and you are relying on your injectors to cut back the fule, which helps, but is not the right way to do it. Spoolinup sells complete 1G kits for $145, I am still waiting for the 2G to be completed.

 

[Formz]

I personally don't feel that is true. You are entitled to your opinion and I am entitled to mine.

P.S. Venting to the at.... ahhh forget about it

 

[2-0turbo]

Originally posted by Formz
You do NOT always need an aftermarket FPR when running a 255 or supra pump. There are literally hundreds of DSMers running aroudn with the stock FPR, a Walbro 255 and NO problems whatsoever. I am one of them. Usually, the only time people have problems is when they rewire the walbro, but on the stock wiring the walbro is fine.

Yeah, Umiami80 said it too. The FPR is supposed to LINEARLY increase fuel pressure with boost. It needs to do that because your ECU plans on it doing that. Those big pumps just flow too much (even without rewiring them) to reject enough fuel at idle through that TINY stock orfice. I haven't looked at your mods yet, but if you are running an AFC and trying to tune with your fuel pressure at 50 psi up till 7 lbs of boost and then it going up from there, it is really tough. You CAN do it, but it make things difficult.

 

[RocketDSM]

I have the B&M CommandFlo, and even with the stock fuel fump I can't get it to go below 42psi. I can attest it has been a tuning nightmare. My fuel is all over the place, I've spent months trying to get it under control without having to buy a S-AFC. I have a Walbro sitting in my bedroom and I'm scared to install it.

 

[L2RTSiAWD]

I can say you don't think you need one until you get one then you realized how much better it would have been if you would have bought one 6 months ago. I have the spoolinup on my 2G and my car Spools,idles,and runs better than ever.

Later,

 

[rdrkt]

Originally posted by RocketDSM
I have the B&M CommandFlo, and even with the stock fuel fump I can't get it to go below 42psi. I can attest it has been a tuning nightmare. My fuel is all over the place, I've spent months trying to get it under control without having to buy a S-AFC. I have a Walbro sitting in my bedroom and I'm scared to install it.

The BM can only raise your fp not lower it. I have an AEM fpr. I had an npt fitting welded onto my fuel rail and it attaches there. As many of said idle is better, fuel economy is better, it drives smoother etc.

 

[jdmawd]

Where do they find these people?? You don't need to lower fuel pressure with a 255lph fuel pump of course you do. Next you wont need a boost gauge with a boost controller:laugh:

PS: my car is set up to vent whats you're point?????

$130 bolt it up and be done

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[RocketDSM]

Will this sucker change the FP with boost? That has been my biggest problem.

 

[jdmawd]

Originally posted by RocketDSM
Will this sucker change the FP with boost? That has been my biggest problem.

yes 1 psi, for every pound of boost 1:1 ratio

 

[ILOSE]

Originally posted by umiami80


Wrong, check your base FP and I guarantee it is above 50 when it shouldb be infact below 40.

WRONG! how's that feel?

You people kill me! Stop just repeating everything you hear or read. I bet you have never measured your fuel pressure? I run and have had other cars run without an AFPR "OK". Without the rewire and with 255 I have seen at least 12 cars that have a base pressure of 41-44. Mine is at 43 which is great. FP plays a few different roles, to increase adjustability. I have not tuned any cars where the optimum pressure was below 40 as you stated.

The real problem with not having an AFPR is at higher boost levels the stock fpr can become inconsistent and that'll change timing and afr.

Am AFPR "should" be a part of the staged upgrades in line with the fuel pump and afc or whatever to "properly tune.

AFPR's are needed, I just wanted to clear up some misconceptions and rumors.

 

[2-0turbo]

Originally posted by ILOSE


WRONG! how's that feel?

You people kill me! Stop just repeating everything you hear or read. I bet you have never measured your fuel pressure? I run and have had other cars run without an AFPR "OK". Without the rewire and with 255 I have seen at least 12 cars that have a base pressure of 41-44. Mine is at 43 which is great. FP plays a few different roles, to increase adjustability. I have not tuned any cars where the optimum pressure was below 40 as you stated.

That is fine if you are running 43 psi and if YOU SET it at 43. 1G cars stock fuel pressure is 36 PSI and yes, I've measured it. This is set with the manifold signal disconnected from the FPR. So, at idle, your fuel pressure is even lower (quick math in head), 26 psi. So, if your FP happens to hover at 43 after a FP upgrade, you are over-running it and your fuel pressure CANNOT go down to 26 like it is supposed to at idle. So, you are flowing too much fuel at idle and your fuel pressure does not linearly increase from -20 vacuum to 0 manifold pressure like it should. It IS a problem and you can bandaid it all you want, but it is not the ideal setup.