the may turbo magazine has a regulator in the new products section by a company called comptech. it looks pretty good so i called them up. they said the press release was too early and they didn't have their spec sheets on it yet so they couldn't tell me the pressure range and rise-rate range. the guy said he'd call me back in a couple of days. like most pressure regulators, it's meant to mount after the rail. this regulator will completely replace the stock regulator and also act as the riser too. that's originally what i thought the bell tech regulator did, but Corky Bell said it's not. so you'd only have one piece to mount instead of two. as long as this guy can deliver these in a reasonable amount of time, i'm gonna cancel my order will bell and go with this baby.

Alternatively, you can go with VORTEC's SFMU. It's a bit huge, but it works.


l e o n

Hoot,

This FPR sounds all well and good, but I tell you what. My FPR looks EXACTLY like the Bell FPR. If it's not, then I manage to have an EXACT replica of the Bell one and it does everything you've just decribed.

I have totally done away with my stock FPR. (I know that cause it's sitting in a big box with all of my other stock stuff)
The Bell FPR has two adjustable screws.

1) The one in the middle adjusts the static non-boosted fuel rpesure.

2) The brass one on the extreme top side depending on how you'rve oritned your FPR on your car adjusts the boosted fuel pressure. It's not very complicated.

I truly think you and Corky may have had your wires crossed when discussing this product or Corky is too far removed with what his products can accomplish.

This is EXACTLY what my FPR looks like.

http://www.bellengineering.net/miataextras.html
The silver allen screw (not totally visible from this perspective) in the middle is the static fuel pressure and the far brass screw that can be hand-turned adjusts boost fuel pressure.

I'm tell'in ya brother....that's my FPR.


Jason
98' Eagle Talon ESi-T
Mitsu Super 16g Turbo(HRC)/Custom FMIC


http://springfielddsm.homestead.com/JasonsPics.html

hmmmm...

that sure does look like a bell fpr. are you 100% sure it's a bell? did you get it from bell or from somewhere else?

corky told me that they tried to get their regulator to work as you described but it wouldn't work right. something about the base fuel pressure not being stable or something. maybe i'll just stick with the bell then cuz it's been used and proven already.

what is the range of adjustment on the bell(?) regulator that you have? i'm probably looking to set base pressure down around 30psi and have it come up to about 60-70 under 12lbs of boost. is that within the adjustment range?

i guess i'll cancel the order on the regular regulator that i ordered if i only need the bell fpr. that's good news, you just saved me a few bucks. thanks.

LAST EDITED ON 05-Apr-01 AT 11:57 AM (PST)

Well,

I have a few comments. The FPR came from HRC.

First, as to the base fuel pressure being unstable. That may be a possibility for some. I've heard grneclipse and Corbin both complain about similar symptoms. So I wouldn't rule that out. I've heard from HRC though that it's simply a case of the spring(I think) in the FPR warming up. I don't know.

Either way, I haven't noticed a huge amount of fluctuation for the base fuel pressure, but I have noticed some. Again, not a lot. So I would agree with Corky on that one. It definitely might be a small imperfection. The type of fluctuation I have heard about is anywhere from 60 to 50psi from cold start to warm. I haven't experienced this amount of flux though. (I keep iut lower closer to 45 psi b/c of my two big fuel pumps and it pretty much stays there...car also seems happier the lower I keep it)

However, as to the boosted fuel pressure, it's rock solid. HRC has you adjusting anywhere from 80-110 boosted fuel pressure with a second inline fuel pump. I think you can go fairly low, but I don't know how much lower under 80 lbs of fuel pressure. You could probably set it fairly low with one fuel pump, however, I can't give you a definite answer. I'm sure this amount would fvary depending on what you's pushing. At base you can definitely go as low as you want. Murix has it about 32 psi at idle with his 400cc injectors. There's a lot of intangibles that effect your ability to adjust fuel pressure (Fuel pumps, injectors, fuel rail...etc)

I don't want to set you wrong, though. If there's something nicer out there for a reasonable price, I would definitely go for it. The Bell model is nice, and seems sturdy as a rock though. You can tell it was constructed nicely. I could probably drop it on the pavement all day and it would be just fine. However, I would ask around at other adjustable FPRs and see if there's a common fluctuaion problem in base fuel pressure amongst other brands. I bet it might b/c of weather and such. Who knows?

I doubt it's much to worry about though.

Jason
98' Eagle Talon ESi-T
Mitsu Super 16g Turbo(HRC)/Custom FMIC


http://springfielddsm.homestead.com/JasonsPics.html

i got a fax from comptech with the specs on this regulator. it uses interchangeable springs and discs for static pressure and rise-rate. there are only two discs available and they have a rise ratio of 5:1 and 7.5:1 which is higher than i need. there is also some sort of air bleed which can reduce the rise-rate, but i'm not to keen on the way it sounds.

i guess i'll just stick with the bell regulator that i already have on order. as for the unstable base pressure... i'm gonna use a standard adjustable pressure regulator to keep things rock solid on the bottom. so i won't have to worry about mounting the regulator where it will heat up fast. the bell is supposedly adjustable to around a 2:1 ratio so that will work perfect for what i need.