3000gt VR-4 fp on 2g

[Gators453]

thanks for checking this thread out. Ive read a lot about the 3000gt vr4 fuel pump, and in general have read a lot of good things, but it seems to be that i found it hard to find stuff on guys who put them into 2gens. i know that some modification is needed to get it to fit, unlike 1gens it drops in, but my question is this:

i have a friend with a '93 3000gt vr4 who is going to GIVE me his stock fuel pump for FREE, and seeing how i still have my stock one, i cant wait to get it. however, i was trying to find if it is worth doing, or should i just go with the walbro 190 rewired off the bat?

I'm running the fp big t28, right now on stock boost level (all mods are current in my profile) except for this weekend i am going to be ordering a downpipe and boost controller, which is why I'm asking about the fuel pump. What will be a safe boost i can run with the 3000gt pump? will i max out my 450's and need to upgrade those? this is why I'm wondering if it would be wise to just spend the money on upgrading rather then fixing if i mess up.

in short, I'm asking will it be safe to use a 3000gt vr4 fuel pump without maxing out my 450's, or should i just do it right the first time and go with the 190 walbro and get over the fact I'm going to have to spend money rather then get it handed to me? thanks a lot guys.

Kyle

 

[Defiant]

I've seldom heard of them being used. I don't know if there's reasons for that. I've heard of the Supra pump being used more.

 

[arash15]

you will be ok with the rewired vr4 fuel pump. it is similar to the walbro 190lph pump. you wont max out the 450's, but you do need to upgrade them sooner or later. you will notice a little buzzing noise because its receiving a constant 12v source (aka the battery), but thats normal.

 

[BoostedTalonTS]

Here is some good flow info on the 3000 pump (and more importantly, it's flow in relation to other aftermarket/OE pumps that are available):

http://www.stealth316.com/2-fuelpumpguide.htm#j4

-I was originally considering the same swap on my 1G, but after seeing that info, I opted for something a bit larger and ended up going with the Rx-7 OE pump (-0782) model. It was a direct drop-in for my 1G, and doesn't make any more noise than the stocker!

 

[Gators453]

thanks a lot guys for the helpful information.

I'm trying to stay out of the 255 and 255lph pumps b/c i know you need the fpr with those, and I'm pretty sure the 190 will be fine on my 450's for what psi i plan on running, but if i do upgrade the 450s to the 550's or the stock 560s from a Evo, would i be in danger of maxing out the 190 pump rewired? again, thanks a lot for the help guys.

EDIT: after reading the information posted by BoostedTalonTS, it seems to be that the 255lph pump would be the best for me to get...? this shocks me b/c i had always thought that pump was over kill for what i had wanted from my car? unless im reading it really wrong, please correct me.

"The Walbro GSS341 model (also called the 255 lph HP) flows a little less than the Supra Turbo pump up to about 67 psi line pressure (24 psi boost), when 13.5 volts are supplied to both pumps. However, at 12 supplied volts, the Walbro GSS341 outflows the Denso 195130-1020 above 55 psi line pressure (compare John Cribb's Supra pump data to the Walbro charts). Like the Supra fuel pump, the Walbro GSS341 is an excellent choice for 450 cc/min injectors, especially if the fuel pump has not been re-wired (12 supplied volts). Also like the Supra pump, it can be used with up to 610 cc/min injectors if 13.5 volts are supplied, and up to 720 cc/min injectors if at least 16 volts are supplied. The Walbro GSS341 draws about half as much current (at 13.5 V, 8A @ 43 psi, 10A @ 70 psi) as the Supra fuel pump. Some slight modification to the fuel pump assembly is required and it may not be as quiet as the Denso pumps. The price is even less than the Supra pump at $100 to $150. "

from what i gather from this...again correct me if im wrong...i should be ok to run this fuel pump on my stock 450's aslong as i dont rewire it. once i rewire it however, i will need to upgrade the injectors, correct? which is when a fpr will be needed i assume.

 

[AWDrift]

Just woke up and read this, so sorry if this is completely off...

But isn't he talking about *6* 450cc injectors, while you would be using only 4?

Someone correct me if I'm wrong

 

[BoostedTalonTS]

According to this ( http://www.stevetek.com/R-FuelSys.html ) your stock fuel system is barely cabale of supplying the existing injectors with enough fuel... Regardless of the size of fuel pump being used (it does help, but just not as drastically), the problem lies in transporting enough fuel for the upgraded injectors.

I particularly liked SteveTek's flow bench results in the before & after tests... Keep in mind that this was all done on an OE pump.

I ended up doing something similar with AN-06 line, but went a different way with the filter & AN-06 fuel rail adapters... Now it seems like I have too much fuel for my Evo3's 36lbs/min of output @ 18psi of boost, with my 660's.

I also liked the idea of using another OE Denso pump for two main reasons: Less noise, and proven OE performance/reliability.

Also, you don't need to upgrade your injectors because of a fuel pump... It's kinda' the other way around... You upgrade the fuel pump to help supply enough fuel to the rail FOR those upgraded injectors. All you are accomplishing with the pump's rewire is supplying the pump with additional voltage to maximize it's output, as the tiny 12AWG wire that it got from the factory builds a lot of resistance that ends up decreasing the total amount of available voltage at the pump.

 

[BoostedTalonTS]

Just woke up and read this, so sorry if this is completely off...

But isn't he talking about *6* 450cc injectors, while you would be using only 4?

Someone correct me if I'm wrong

Yes, as some of you may notice, that link is from the 3si forum... Basically v-6 TT's. -I never said that this info was DSM specific (well it is, just not for OUR 4G63T DSMs, it is for the 6G74's). It is however a good fuel pump comparison page though.

 

[Gators453]

Just woke up and read this, so sorry if this is completely off...

But isn't he talking about *6* 450cc injectors, while you would be using only 4?

Someone correct me if I'm wrong

I'm glad someone caught that, i knew that it was specifically for the 3si's, but never thought about those 2 more injectors stupid me...

although, I'm still sort of confused. seeing as how they say the 255lph fuel pump is ideal for them on 6 450's... that would be over kill for us then correct? b/c as i was reading that i knew it didn't seem right that a 255lph pump was ideal for our stock injectors...but now that i think about it the 2 more injectors on the 3000gt makes sense. so in other words, i should go with the 3000gt vr4 fuel pump or a 190 correct. correct me if I'm wrong please, but I'm thinking if they say the vr4 pump can handle between 12-14 psi and deliver 180lph at 13.5volts, is being stated on 6 injectors correct, so on 4 injectors, this would increase its capabilities right?

I apologize, for some reason I'm having more trouble grasping this then other things...thanks for your patience.

 

[Turbocharged]

I had a vr4 pump on my old set up (SBR 2g20g, 660's, supra smic) and never had any problems running lean. I was running 18 psi on that setup. Its a good upgrade especially if its free.

The vr4 pump doesnt fit that well in the stock location. The pump has a much larger diameter than the stock pump, which makes it sit at an awkward angle. The only important thing is that it is tight seal at the top (where the pump meets the fuel line). Also, the wiring harnesses arent the same so you have to "hot wire" the pump.

I have since upgraded to an AFPR and a walbro 255 to support higher boost on my 50 trim.

 

[LessIsMore]

3000gt fuel pump is a direct swap into a 1st gen fuel pump assembly, while the Walbro is a direct swap into a 2nd gen assembly.

My opinion is,
1st gen with stock fpr should use 3000gt pump
2nd gen with stock fpr should use Walbro 190Lph

If I was you I would sell the 3000gt pump and get a 190lph just for the sake of simplicity.

By the way I'm using a rewired 3000gt fuel pump, maxing out stock injectors with 16g at ~15psi.

 

[Gators453]

thanks alot for your help guys, I think that I'm going to go with the walbro 190. again thanks alot for all your useful information and feedback.


Kyle

 

[RamenPride]

yeah, for sake of simplicity the Walboro is a direct replacement on the 2G. however, I didn't want to live with the whine of the walboro so I went with the 3000 GT VR-4 fuel pump. wasn't too hard to make it work and it flows almost the same (180lph).

 

[mitgsx]

You can see mine went 12.02 with a s16g. I paid like $45 shipped for my VR4 pump.

 

[Maglin]

I have a 255 and I don't even notice any wine. Only time I heard it wine is when my altenator's voltage regulator went out and my pump was getting 18 volts. Even then the wine wasn't that noticable as the exhaust is louder than the wine.

I wouldn't disregaurd the Walbro cause you think it wines to much. I'm a 1G but like I said I can't tell if it's wining. And I don't have anything over the take to dampen any noises from the fuel pump.

 

[Turbocharged]

Walbro wine is overrated. I can hardly hear mine over the exhaust. You have to listen for it if you want to hear it. Either way, Im glad I upgraded from the 3kgt vr4 pump.

 

[Gators453]

man, thanks again guys, i never expected to get so many replies . i still haven't decided, but it sounds like I'm leaning toward the walbro 190... ... it seems to be the safest route.

 

[doug]

I know I'm late to the party, but my power's been out because of the hurricane.

I have a 3000GT VR-4 pump on my '98. I pretty much agree with what's been said already-- it was kindof a challenge to get it to fit since it's larger than the stocker and you have to "hot wire" the connectors on top as has been stated. It is dead quiet, though, and according to that RRE link, flows more than the 190 at lower (real world) voltages.