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first impressions with q45 TB

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Old Jun 3, 2008 | 09:06 PM
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Default first impressions with q45 TB

I just got done installing a carb style intake, custom plenum, and an infiniti q45 90mm TB that was off of ebay for 80 bucks.

Initial impressions of q45 TB:
1. OEM quality
2. NO IAC
3. Does have cold start high idle
4. Takes 3.5inch hose
5. Has D end shaft to install ls1 TPS with some minor mods.


Car idles absolutely beautifully without any surging, hunting or stalling. Although i know a lot of this stuff can be tuned out, you're killing two birds with one stone, cheap 90mm TB and idle BS eliminated.

Questions, Comments?
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Old Jun 5, 2008 | 09:49 PM
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no iac?
post some pics of your intake
and what u had to do to make work
im listening
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Old Jun 5, 2008 | 11:25 PM
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might have upset some people @ nick williams and fast, great find, shoot up some pics!
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Old Jun 5, 2008 | 11:43 PM
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This is a super popular TB in the Import world, I too would also like to know what had to happen to make it work.

too bad its not a bolt on affair for a LSx intake I wouldnt mind having a nissan TB on my GM motor in my nissan car....it would help with the "sleeper" effect.
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Old Jun 6, 2008 | 12:09 AM
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I too would like to see pics.
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Old Jun 6, 2008 | 05:26 PM
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might be some cellphone pics tonight guys. i dont have a digi (even though its 2008) id rather spend money on car parts and guns lol. Ill try and get some decent ones soon.
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Old Jun 6, 2008 | 07:56 PM
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Originally Posted by Hennytime
might have upset some people @ nick williams and fast, great find, shoot up some pics!
Naw...I'd say it would be great for custom app's on a budget, but for those that want the best performance no OEM unit out there, even ported as good as can be will equal the flow of the top quality after markets.





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Old Jun 6, 2008 | 08:03 PM
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Originally Posted by Libertysyclone
This is a super popular TB in the Import world, I too would also like to know what had to happen to make it work.

too bad its not a bolt on affair for a LSx intake I wouldnt mind having a nissan TB on my GM motor in my nissan car....it would help with the "sleeper" effect.
I agree completely. They can usually be had for under $80 bucks. Minor modifications vs. $360+ for bolt-on 90mm throttle body. I'll go with the Q45 and port it myself.

Last edited by on2; Jun 6, 2008 at 09:01 PM.
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Old Jun 7, 2008 | 12:28 AM
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^^+1 cartridge rolls and mandrels are cheep
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Old Jun 7, 2008 | 06:54 AM
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Obviously you will have to make an adapter for plastic intake manifolds since you cannot drill/tap plastic, but that's cheap and easy.

https://ls1tech.com/forums/conversions-swaps/703158-been-lurking-my-ls1-drift-car-240sx.html
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Old Jun 7, 2008 | 09:48 AM
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i would imagine you could make an adapter plate that has countersunk machine screws to go into the fast manifold, then studs that the TB bolts to.
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Old Jun 7, 2008 | 09:50 AM
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This is nothing new, that TB has been kicked around here for a few years now. Most guys want the right TB so I dont see it as an issue. Having to "rig" it to work like the correct one is good for someone on a tight budget who deosnt really care, but most would rather have a TB that work properly so honestly its not competition to anyone in here.

Heck if you want to go that route why not go with the El cheapo that already comes with an adapter plate on there? He already did the work for you and its as cheap as it gets.

I've said it a thoursand time and I'll say it again. You get what you pay for in the performance parts world. Look for the cheapst thing you can find and that's what you get. Does it work like the more expensive unit? 98% of time not even close.

The two best TB's I've seen/used are the RevXtreme and the NickWilliams. Honestly I think the RevXtreme is a little better, not to say there was anything wrong with the NW because there wasnt at all. The RevExtreme is a little more money but you can see where the money is spent. Both are very nice units!

Last edited by 99blancoSS; Jun 7, 2008 at 09:57 AM.
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Old Jun 8, 2008 | 05:24 PM
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just connected the coolant lines for the fast idle warm up. starts at idles at 1000 rpm then backs down to 850 when warm. No IAC too.
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Old Jun 9, 2008 | 07:45 PM
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pics of the tps modified for the q45 tb?
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Old Jun 10, 2008 | 05:02 PM
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sorry guys. this heat wave up here has been killing me at work. Ill try and get the pics as soon as i can.
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Old Jun 16, 2008 | 05:46 PM
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Makes me wonder if the 90mm Q45 MAF can be made to work.
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Old Jun 16, 2008 | 06:22 PM
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i doubt it would be worth the effort. just run SD at that point.
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Old Jun 21, 2008 | 10:49 AM
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did u ever get the pics of how the tps was modified?
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Old Jun 21, 2008 | 11:34 AM
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sorry guys i havent touched the car in weeks. I had a junk tps that i just drilled out and mounted backwards on the shaft.

I have a new one that im going to be reversing the wiring on.

Its pretty simple.
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Old Jun 23, 2008 | 11:18 PM
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