Trust the Tuner?
Posted 29 February 2012 - 08:50 AM
Here is the setup I plan on running:
-Driftmotion rebuilt 60 trim ct26
-HKS 256/256 cams
-JDM 2J 440cc Injectors
-R33 GT-R Fuel Pump
-Gizzmo Intelligent Boost Controller
-Power FC w/ Hand Controller
I contacted Touge Works, the tuning division of Touge Factory in Chicago, and said I wanted to get the car tuned for 350-400hp with this setup. They replied back that 440s won't be big enough to meet my goal. I have read that the stock 370s maxed out are good for 420hp. I have also seen 1JZs make over 400hp with 440s.
So, should I trust the tuner, or tell them they are fucking stupid and have it tuned with the 440s?
Posted 29 February 2012 - 09:55 AM
According to the standard injector sizing calcs you should have 525cc/min flow to safely fuel 400 hp at 80% duty cycle. You can probably hit 400 with 440s, but if you're going to do it, you might as well do it right the first time and at least get a set of 550s for extra peace of mind. It's not like they cost as much as a new bottom end.
"JZXP - we get death threats" -Rayray
-1987 AE86 Corolla with 20 valve swap SOLD
-1985 MX73 Cressida 1.5JZ Holset HX35 & MS3X
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Posted 29 February 2012 - 10:09 AM
That being said, I would tune it for you with 440cc, I just wouldn't run it past 85-90% fuel duty, and I would set a fuel cut just incase you decided to be a dumbass and try to run more boost.
Also depends on how rich your tuner wants to run the car. I don't like running cars pig rich because it's inefficient and washes out the rings.
Posted 29 February 2012 - 10:28 AM
As a tuner id go 550. As a cheap ass I'd do the 440. But srsly, 440 is okay for 350. 400 not so much. And how are you controlling boost with that setup? What's your ecu?
I ran 380whp on my GS with the stock 440cc injector...through an auto.
Like I said, it depends how rich your tuner wants to run your car.
Posted 29 February 2012 - 11:10 AM
Don't believe me, then go to RC Engineering's web-site.
They have a program to figure injector size.
My 1000cc injectors will only support 800 hp @ 45 psi.
And make damn sure that you have enough fuel pump to flow 6 injectors at their rated flow & pressure.
You would be supprized at how many people throw a look-a-like walbro 255 on 550cc injectors, and fry pistons.
A true Walbro 255 HP is bearly big enough for that.
Remember, you can't just jack the pressure, as pump delivery goes down as pressure goes up.
Just look at the flow rates on the Walbro Distributor's web site.
And the chinese rip-offs are even worse.
Posted 29 February 2012 - 11:51 AM
According to the calculators, I should be able to safely run ~325hp with 440s. That's not too shabby.
Posted 29 February 2012 - 06:53 PM
Posted 01 March 2012 - 06:29 AM
Skitzo, the current pump in my x9 is 15 years old and still pumping strong. I plan on testing the GT-R pump before I put it in. A part isn't junk just because it is OEM, old, and from a certain company. I have seen several cars run stock Nissan Z32 pumps without issue. The GT-R was pretty much Nissan's cream of the crop. This is clearly a budget build. I'm using a rebuilt CT26 for f#ck sake.
I got offered a set of Blitz 540cc injectors for $250 plus shipping and paypal fees. Apparently they, "flow better than stock 2J 550cc injectors". What do you guys think?
Posted 01 March 2012 - 08:30 AM
Usdm are 550
Posted 01 March 2012 - 08:31 AM
Posted 01 March 2012 - 01:42 PM
most injectors won't actually be fully equal across the board, especially used ones. getting them tested and then adjusted to match is a really good idea.
Guest_Gaijin Smash Wayhoff_*
Posted 01 March 2012 - 02:18 PM
Posted 01 March 2012 - 03:46 PM
And FYI, i would trust a 15yr old OEM fuel pump over an Aeromotive stealth pump anyday. 3 of the 4 a1000's I sold last year failed. American made junk.
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