[Evansa22]

Originally Posted by Joshinator99

If you don’t do a voltage booster, then the low side drops out first. This can take out the high side very shortly thereafter. So, you have to datalog both of those plus injector pulse width to get a solid understanding of how your fueling is really doing.

This right here. Great call. I've seen the voltage boosters recommended by many including jre. I believe I saw somewhere 700-750 max hp with the voltage booster. Then high side falls off like you mentioned. Might be worth the few hundred $ if you want that last bit of power, especially if you're adding the big gulp

[Evansa22]

also very interested in your setup. I'm looking for maybe another 100hp and debating whether I go for the jre 125hp which is running e85, or spend the money on the 2650 and retune. How do you like that setup? You run it on a road course or at the strip at all?

[radz28]

Big Gulp required a retune for me, and I'm running pretty much stock everything else (minus a tiny exhaust mod'). I think I'm seeing slightly higher boost, too (probably around 1-2-psi) over the standard RF. Now that we're getting into Boost Weather, my boost is creeping a little higher with better DA.

If you're looking for every little bit of power, maybe it's worth it. Because I already had tuning available to me, the expense was the BG, and gas for tuning (tuning will add more $$$ if you don't already have HPTuners, for example). There was a considerable increase in air flow through my MAF, so there is a difference. Fueling was way off after the swap, too. There's got to be a good gain. I've yet to dyno my car in any combination. I believe, though, that air flow into the blower is slightly better at this power level than air flow out, so I tried to optimize the intake side better.

I'm right on the edge with fueling, too. While I seemingly have complete control over fueling, I can see that when I'm running a little rich, that my fuel pressure starts to slightly drop at the top of the RPM-range. My EQ doesn't go lean at that range, as a result, and my PW is well under 6.5, but I know that's a pretty hard limit. I know that cleaning that area of my fueling-up will bring me back to the safe side, but I know, with a completely stock fuel system, I'd right at the edge. I'll probably add a pump booster a little down the road, but it is not evident I need it now. This Boost Weather is giving me a little more boost than I want, and this is where my high side starts dropping a tiny bit, so after I make a boost adjustment, I think I'll be totally fine. 700-750-RWHP seems to be right about where you need to start worrying, so far as I can see, and seen others experience.

I have no regrets upgrading to the BG. I can't substantiate any claims with a dyno. I know that my car moves air as much as another car, with nearly the same mods' that makes a little more than 700-RWHP, and that's all I was looking for. This dang car is almost too fast to have fun in on the street, hahaha. The cooling is unbelievable, too.

[KingLT1]

I had to retune mine when I switched to the Big gulp from standard RF. Most of the MAF curve was off 15-20%. It also wanted more fuel up top...it is pulling more Maf lb/min and cylinder airmass increased. That all tells me it's making more power. If I had to guess I gained 15-20whp looking at my logs.

[radz28]

Originally Posted by KingLT1

I had to retune mine when I switched to the Big gulp from standard RF. Most of the MAF curve was off 15-20%. It also wanted more fuel up top...it is pulling more Maf lb/min and cylinder airmass increased. That all tells me it's making more power. If I had to guess I gained 15-20whp looking at my logs.

This is precisely in the neighborhood of what I was seeing.

[Camaro1973]

Originally Posted by Evansa22

also very interested in your setup. I'm looking for maybe another 100hp and debating whether I go for the jre 125hp which is running e85, or spend the money on the 2650 and retune. How do you like that setup? You run it on a road course or at the strip at all?

Too me its worth it, because with the addition of a cam with fuel lobe at 38% you'll be well over 750rwhp. The blower is very effecient even with stock cam its making peak torque around 670 at 3400rpms. LT4 blower might make peak a bit lower but with the 2650 you have plenty of room for mods and really there is 0 issues with heat soaking.


I didnt drive it much, just had the work done and had to bring it bsck for them to fix the catch can issue, its still there.


I dont track it, but will bring it to the strip.

[Camaro1973]

Originally Posted by Evansa22

This right here. Great call. I've seen the voltage boosters recommended by many including jre. I believe I saw somewhere 700-750 max hp with the voltage booster. Then high side falls off like you mentioned. Might be worth the few hundred $ if you want that last bit of power, especially if you're adding the big gulp

2 shops steered me away from the booster, said wasn't worth it.

[Camaro1973]

Originally Posted by radz28

Big Gulp required a retune for me, and I'm running pretty much stock everything else (minus a tiny exhaust mod'). I think I'm seeing slightly higher boost, too (probably around 1-2-psi) over the standard RF. Now that we're getting into Boost Weather, my boost is creeping a little higher with better DA.

If you're looking for every little bit of power, maybe it's worth it. Because I already had tuning available to me, the expense was the BG, and gas for tuning (tuning will add more $$$ if you don't already have HPTuners, for example). There was a considerable increase in air flow through my MAF, so there is a difference. Fueling was way off after the swap, too. There's got to be a good gain. I've yet to dyno my car in any combination. I believe, though, that air flow into the blower is slightly better at this power level than air flow out, so I tried to optimize the intake side better.

I'm right on the edge with fueling, too. While I seemingly have complete control over fueling, I can see that when I'm running a little rich, that my fuel pressure starts to slightly drop at the top of the RPM-range. My EQ doesn't go lean at that range, as a result, and my PW is well under 6.5, but I know that's a pretty hard limit. I know that cleaning that area of my fueling-up will bring me back to the safe side, but I know, with a completely stock fuel system, I'd right at the edge. I'll probably add a pump booster a little down the road, but it is not evident I need it now. This Boost Weather is giving me a little more boost than I want, and this is where my high side starts dropping a tiny bit, so after I make a boost adjustment, I think I'll be totally fine. 700-750-RWHP seems to be right about where you need to start worrying, so far as I can see, and seen others experience.

I have no regrets upgrading to the BG. I can't substantiate any claims with a dyno. I know that my car moves air as much as another car, with nearly the same mods' that makes a little more than 700-RWHP, and that's all I was looking for. This dang car is almost too fast to have fun in on the street, hahaha. The cooling is unbelievable, too.

I ordered the big gulp, will be here wednesday. I am going to bring it to my guy at cartek to have him check the tune. (he was also the original for my baseline which was 564 stock, with just the rotoafab. I believe Andrew at CSP is very conservative in his tunes. He was very busy so didnt get a chance to go over anything in the tune.



It was warm, plus dynos as you know can vary alot even from dynojet to dynojet. Julio at cartek will sit down and go over everything hes adjusted and why, so once i get the big gulp ill head over there to have it redone.


Hopefully CSP is done fixing the dumb mighty mouse issue today.

[laynlo15]

I'd go ahead and install it as Josh says. Don't believe everything you hear, but I'd do the JMS boost pump which is also adjustable if I remember correctly.

[Evansa22]

Originally Posted by Camaro1973

Too me its worth it, because with the addition of a cam with fuel lobe at 38% you'll be well over 750rwhp. The blower is very effecient even with stock cam its making peak torque around 670 at 3400rpms. LT4 blower might make peak a bit lower but with the 2650 you have plenty of room for mods and really there is 0 issues with heat soaking.


I didnt drive it much, just had the work done and had to bring it bsck for them to fix the catch can issue, its still there.


I dont track it, but will bring it to the strip.

Originally Posted by Camaro1973

2 shops steered me away from the booster, said wasn't worth it.

Very interesting about the info on the voltage booster, would like to know their reasoning as im no expert.
Good to hear about the 2650, I have no plans to cam it and 700whp would be max for me but sounds like it's got great low-end torque. Thanks for the info

[KingLT1]

JMS booster works great...

[JasonGofast]

Originally Posted by KingLT1

JMS booster works great...

I've heard it has less effect on the LT4s compared to the LT1s. But this is only from what I've heard...

[Camaro1973]

Originally Posted by Evansa22

Very interesting about the info on the voltage booster, would like to know their reasoning as im no expert.
Good to hear about the 2650, I have no plans to cam it and 700whp would be max for me but sounds like it's got great low-end torque. Thanks for the info

They basically said its ok if you want that extra 10hp if your running out of fuel, and said it simply just isnt enough to keep the system optimal. I think just because when your at that point it might be better to just do an aux pump or a cam at that point and not waste money or time for a few extra hp and I understand this completely.

[KingLT1]

Originally Posted by JasonGofast

I've heard it has less effect on the LT4s compared to the LT1s. But this is only from what I've heard...

I am running a LT4 low side pump and injectors with a LPE HPFP.

10-11psi on E60 with bolt-ons, low side holds 70psi.

My brother has a JMS on his C7 Z06. It is Heads/Cam Maggie 2300 @ 13.5psi, full bolton, +30 injector, LPE hpfp, stock low side with JMS and LPE check valve. Low side stays above 50psi on E60.