1st Question:
Is it true u should upgrade the fuel pump in a wet application?

Reason I ask is we have a car making 420RW on a stock fuel system which consists of a 190LPH and a set of 33lb inectors (06 GTO)

I was told the pump may not be up to snuff to keep the rails constantly fueled correctly once we add the 100 WET SHOT to the system which could cause a fuel supply issue?

Is this true?

2nd Question:
Right now the injectors are at 90DC which is high but lets face it your only at this dudty cycle for a short time and shouldnt run into any problems but again once u add the 100 WET SHOT to the mix even though u are taking fuel from the rail wouldnt this hurt the DC since u u are taxing the pump?

I know the inj dont come into play with a wet kit persay but I was more looking at the volume in the fuel system and thinking the stock pump would be taxed even harder with the WET shot taking fuel from the rail which in turn might hurt the DC?


I guess the true way to find out is put it on the dyno but I'd like to hear from u WET GUYS on this subject.

Thinking which can be dangerous so I will leave it up to the guys that have tested my theory?

 

yes, grab one of the $99 walbros from heavy6.0 in the sponsor sale section.

 

I would say you need more pump. I have a racetronix 255 and with a 150 shot I'm down to 50psi.

 

Depending on how much room you want to grow, you could go one of 2 ways IMO. You could go with a dedicated cell ( maybe overkill for your setup, but I love mine) or you could go with dual 155's in the tank. Either way, I think you're gonna need more pump. The only true way to tell is to get a gauge on it. The other thing to factor in is the additional wear on that pump from running at max effort.

 

Fuel pumps put out a specific volume of fuel....they run at a constant rate unless you are changing the voltage at the pump.....the regulator is controlling the pressure. If you are loosing pressure it means you don't have enough volume or there is a restriction.

Back to the OP.

I would upgrade the 190lph pump to a 255lph unit. This will give you enough volume to support the HP you are wanting to make.

A wet kit should not affect your injector duty cycle.

 

Sorry, I guess I ***-U-MEd that at the minimum there would be a hotwire kit in the mix.
Good looking out.

 

The hot wire kit increases and maintains a constant voltage at the pump....it doesn't allow you to adjust the speed at which the pump runs.

You would need something like this to do that.

http://store.summitracing.com/partde...5&autoview=sku

or ....

http://www.kennebell.net/accessories...boostapump.htm

 

I'd put a racetronix kit in the car and call it a day.

By the et calculators I am making about 750 flywheel with one and have zero issues with pressure drop of any kind.

If your injectors are at 90%... I'd do something with that. I'd put a set of 42's in there for the piece of mind.

As for the wet kit yes the pump needs to be upgraded, you can run it right off the stock rail with no problems as well, I have been for a year and it's worked out fine.

What kit are you looking to go with, if it's an Nos kit shoot me a PM I can help ya with getting the most from it.

 

My Racetronics started running out of room about 650rwhp. Your injector duty cycle being so high really has no bearing on the volume of your stock pump, it may or may not be able to support your needs, but most just upgrade to be sure and if your current pump has miles on it, prob time anywho. the injectors, upgrading them would not hurt, however, if you don't plan on anymore n/a hp or going dry (sorry for saying dry in a wet thread, lol) hitting 90% is not that big of a deal for the limited time you stay there, your call. you know adding a hot wire to your pump can increase capacity by 20% and often helps extend the range of new or used pumps. One of the best mods any of can make on our fuel systems is to get the regulator and return at the rails.
Robert

 

I do have a hotwire on my pump, a 10 guage I did myself from the battery to the pump and the battery is in the trunk so the wire lenth is really short for all intensive purposes.

I am sure it helps.

 

You still take the golden number of mph/weight= hp calculators ?even after proven wrong

 

Too much data to not support it.

470 rw n/a + 150 rw Nos jetting = 620 rw. Figure a 20% drivetrain loss which is about standard for sutomatic cars and that put it at 744 flywheel, or about 750 give or take.

Works out to me.

I'd ignore the hp claculators if there wasn't 50 years of drag racing that supports them.

I'd believe that slide ruler before I'd believe a dyno. Ya race on the track.... not the dyno.

 

I agree, dyno #'s are for benchracers. The dyno is just a tool for dialing in a tune without breaking every traffic law know to man.What gets me about the calculators is that they seem to differ for every car I've owned. I use them, but just for approx. #'s

 

i run racetronix and 34lb svo injectors and i am psuhing 60psi!

 

I dunno man. I have one that my grandfather gave me, old *** cardboard one that's probably from the 60's

Last year when the car was about 3550 with me in it and a 1/2 tank of gas it would run 10.5x all day long at 125 to 126 mph, that said about 560 hp to do that, and the car made 477 on the rollers @ eastside, 20% loss, seems right to me.

This year @ 3350 it runs 9.5x @ 142.x again, slide ruler seema about right saying 750 hp, comsidering I've added a 150 rwhp hit to it.

People can say what they want, but every car with the exception of a very few work out right, and I always wonder if the weight or power # they give me isn't correct.

 

That's pretty cool.