I would think it does not matter how many fuel pumps you use. The walbros have a psi limit of 75 to 80 psi. Your base pressure cannot go higher than 60psi, or your pumps will not flow past 20psi turbo pressure. If you want higher base pressure you should swap out those walbros for the dual 340's. Also, walbro is rumoured to be coming out with a single 420lph pump that should be good to 100psi or more.

 

Its already out, if you are talking about the 400lph. I got mine from T1 (great price). Hoping to get near 600whp on e85 w that pump and id2000s.

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Nice! is it as loud as 255s? I would switch to 340s solely because of how quiet they would be.

 

it's suppose to be on the same noise level as the 340 pumps, I haven't gotten to install mine yet (was supposed to this last weekend)

 

Nice! is it as loud as 255s? I would switch to 340s solely because of how quiet they would be.
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My single FullBlown 340 is actually noticeably quieter than my previous Walbro 255.

With regard to your question above about running your injectors at 90% Duty Cycle......Most tuners don't like to "Max-Out" the duty cycle on any injector set-up becuase you want to leave room for margin of error and random day to day fluxiations of the system itself...kind of like a safety buffer. It is up to each specific shop / tuner as to what they feel comfortable with.

My guess is that if you posted a poll you would get all kinds of guys thinking they got all the answers because of what they read, heard, or are doing.....

The guys at Speed Factory, who did my entire build / tune, and tune for a number of other Race shops run their drag-race cars right up to 99 - 100% injector duty (I know because I asked)...but...feel plenty comfortable at low 90% range for a street / daily set-up car.

I agree with what DFWs2k and s2000442 mentioned above.....sounds like you need to swap out the 255's for the 340-lph or the 400-lph to get to where you're trying to go with your set-up.

 

Not for nothing but drag cars motors are sometimes rebuilt every race or season. A dd is never hopefully meant to be rebuilt.

Anywho. There is no reason to push an injector that far. It nears the point of going static.

 

I agree with what you said about drag & race cars being regularly "refreshed"...vs....the need for a reliable daily driver, which is why I prefaced my comments with there are and will be varying opinions about "what is right / better". I also agree that if you can run your injectors at lower duty % and meet your needs, that's a best practice that is wise to follow as best you can with what you have.

In my case I was "OK" with the shop running the ID-1000's at 90% duty for a couple reasons.

1. I asked them specifically if they felt it was going be be an issue. They answered "no"

2. They also commented that the ID's are top quality very capable injectors, and they have not had issues with them at that range even as a DD car.

 

I know this is an old thread, but my little brother bought this car from blucky87 and we plan on installing the .82 AR this weekend hopefully. I'm not sure when I'll get around to tuning it, but as soon as I do I'll post a dyno graph.

 

Just FYI I have personally done that swap on a nearly identical setup and the 1.06 made about 10% more power up top and spooled up virtually exactly the same. This was a very controlled test on the same Dyno and same day. Each pull was started at the same water, oil, and air temp at the same rpm.

 

do you happen to have a copy of the map? Batbite has a very very similar build as me but with a smaller housing and his power band is drastically different.

https://www.s2ki.com/s2000/topic/881...e__hl__ptuning