Running low boost on an NA

[t.mcginley.jr]

Hi guys,

So if I have an NA with the stock TT turbos, will running without the boost solenoids keep me around 6psi? Or do I need a boost controller.

[mrmoose]

all i have to say to you is i ran 8 psi on a na with stockers, tt injectors, and it lasted for 80k, i then turned it up to 12, bye bye. so if you keep the boost low you will be ok. like that with most cars, a low boost setting and you will be ok, i turbocharged my ford ranger 2.3l and ran 6 psi, still going! stock everything minus ecu and injectors...just my 2cent

[t.mcginley.jr]

Isn't factory boost at 9psi? How did you keep it at 8? What I really want to know is the best way to keep the boost low (8psi or less). I'm not going for high horsepower, just a little more than an NA has stock.

[mrmoose]

had diff wastegates on it, it was a bunh of left over parts i had lying around. as for lower boost either a mbc/ebc is the only way i know of running lower than stock boost unless you want to open up the stock wastegate and cut the spring down...

[t.mcginley.jr]

Sounds good... I just need to socket my stock NA ecu and put in a TT eprom chip. Then I can keep all my fuel stuff minus the injectors.

[nissanfreak12]

Sounds good... I just need to socket my stock NA ecu and put in a TT eprom chip. Then I can keep all my fuel stuff minus the injectors.

I would at least look at getting a TT fuel pump or similar. The NA fuel pump will not push enough fuel to support the higher demand for fuel. The low rpms will be just find, but higher RPMs or full throttle will not be enough.

[t.mcginley.jr]

Could I swap out the NA pump for one of the Walbro 255lph ones?

[Ace2cool]

Yep. Lots of people do that. With a low boost setup, this will be fine. An OEM TT pump is obviously a better choice, but also more expensive.

[t.mcginley.jr]

Yeah Z1 has the walbro one for $98 compared to $328 for the TT oem one. Do you know if the walbro one just drops in or is there some modification necessary?

[nissanfreak12]

Slight modification, but pretty much drop in.

[mrmoose]

forget the walboro, go with a bosch 044 man thats what i used, way better than th walby i had before it.

[nissanfreak12]

I also read somewhere the Q45 fuel pump is the same as the TT pump and cheaper, could be an option.

[t.mcginley.jr]

Does anyone know what the actual flow rate of the TT one is?

[mrmoose]

no but i do know its good for 600ish hp

[t.mcginley.jr]

no but i do know its good for 600ish hp

Yeah that was actually the question I had... they seem to rate the fuel pumps based on how much hp they can support. So I'm assuming that means the fuel pump can handle the bigger injectors and such necessary to get up to that hp? If that's the case then there's no reason I shouldn't get the Walbro one rated at like 450-500hp on Z1 since I will be under 300hp. Or I'm reading something wrong

[skywhine]

The problem with Walbro pumps is that they only operate on one speed: HIGH, although this is not a bad thing as the extra fuel flow just dumps back into the tank, they tend to ware out faster due to this. The OE pump is at least a dual speed pump.

This is why people complain about walbro pumps "Whining" when not under full throttle, because unlike the nissan pump wich will go into "slow speed" under low load, the walbro stays on "high speed" when under low load. Under higher loads you cant hear either pump, but cruising or idling you will hear the walbro.

If you can handle the whining (which in a fully dressed Z should be quite muffled compared to a gutted 240sx) then i say go with the walbro. Save that $200 for something else, like say a boost controller. (or a rebuild lol)

[t.mcginley.jr]

Ahhh ok I didn't know that about the Walbro pump that it was only 1 speed. Thanks for the info skywhine. Not sure if I wanna here the pump whine all the time..

[skywhine]

No problem. However like i said it may not be that loud in a fully dressed Z. Ive only ever played around with 240's until recently. My Z already has the TT pump so no need to upgrade. In the gutted 240 pretty loud but i didnt care. In the fully dressed 240 still noticeable but not obnoxious, but know that i enjoy the sound of 3" straight pipe so a little whine didn't bother me.

[t.mcginley.jr]

Thanks skywhine, I guess I will need to decide which pump to use at some point. Now for another question...

Does anyone know what's involved in swapping out the NA radiator/ac condenser for the thinner/taller TT ones? Z1 says that it mounts lower in the rad support and than some fabrication is involved. In my head that seems to mean I need to cut a chunk out of the lower rad support?

[nissanfreak12]

Thanks skywhine, I guess I will need to decide which pump to use at some point. Now for another question...

Does anyone know what's involved in swapping out the NA radiator/ac condenser for the thinner/taller TT ones? Z1 says that it mounts lower in the rad support and than some fabrication is involved. In my head that seems to mean I need to cut a chunk out of the lower rad support?

You can get an adapter to put a TT radiator in an NA. Its like 25-50, I know concept Z has them, just dont remember the actual cost. You can always cut off the mounting tabs on the lower cross member an re-mount them to fit the TT radiator. Gonna need a welder for this. The TT Condenser is narrower, but they are getting scarce and hard to find. They do make aftermarket ones that you can get to fit and then get some custom lines to fit. I just recently did this, its really not that hard.

[t.mcginley.jr]

Something tells me when I go to put the turbos on, I'll just end up leaving the AC off. I hardly use it anyway. I'm more concerned about the radiator. I've a few guys say you can just use some aluminum to make your own mounting brackets. Is it okay to secure the rad mounts with some good quality self-taping screws, or is it fully necessary to weld them in?