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N/A Fuel Pump with SC Conversion

 
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SuperRedMR2




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1990 Toyota MR2 Mk1b

PostPosted: Thu Dec 28, 2017 10:34 am    Post subject: N/A Fuel Pump with SC Conversion Reply with quote Reply with quote including images

Hi,

The N/A fuel pump is different to the SC fuel pump is it not?

I'm trying to narrow down why I have suffered with lean fueling.
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Lauren
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PostPosted: Thu Dec 28, 2017 9:17 pm    Post subject: Reply with quote Reply with quote including images

Yes it is. I'm sure I've told you this before but if you run an NA pump you have to run a rising rate adjustable fuel pressure regulator and have it setup on the rolling road. Otherwise it will run lean as the fuel pressure regulator runs a lower pressure than the NA which really causes the issue.

Or you can change the pump and put the correct one in.
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SuperRedMR2




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1990 Toyota MR2 Mk1b

PostPosted: Fri Dec 29, 2017 9:07 am    Post subject: Reply with quote Reply with quote including images

Is there an alternative to the SC pump? Such as a mk2 turbo or the MA70 supra pump?
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Lauren
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PostPosted: Fri Dec 29, 2017 10:57 am    Post subject: Reply with quote Reply with quote including images

Pretty sure the MK2 turbo fuel pump is fine for this. But you'd need to check it is a straight swop.
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SuperRedMR2




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1990 Toyota MR2 Mk1b

PostPosted: Tue Jan 02, 2018 12:57 pm    Post subject: Reply with quote Reply with quote including images

I've found one at Fensport which delivers 176l/hr so that should be more than adequate, plus it's new as well.
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jayelem




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1989 Toyota MR2 Mk1 SC

PostPosted: Fri Jan 05, 2018 8:49 pm    Post subject: Reply with quote Reply with quote including images

I think the fensport one will run at 8bar which will overfuel your motor. The stock sc pump runs at @3.8. Im in the process of replacing mine with a inline pump & run it @ 5bar as ive had some power upgrades.
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SuperRedMR2




Joined: 16 May 2005
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1990 Toyota MR2 Mk1b

PostPosted: Sat Jan 06, 2018 5:11 pm    Post subject: Reply with quote Reply with quote including images

I'll email them and find out - thanks for the heads up.

Can you show me the link for your inline pump?
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Lauren
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PostPosted: Sat Jan 06, 2018 7:56 pm    Post subject: Reply with quote Reply with quote including images

You can change the pump, but you'll still need an adjustable fuel pressure regulator that will need to be setup on the rollers to get the fuel pressure right.

If you fit the adjustable fuel pressure regulator, you don't need to change the pump at all as I have proven some 15 years ago. But I'm not stopping you waste money on a pump you don't actually need. [Wink]
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SuperRedMR2




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1990 Toyota MR2 Mk1b

PostPosted: Sun Jan 07, 2018 5:37 pm    Post subject: Reply with quote Reply with quote including images

If i had the original SC pump would I still need the FPR
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Lauren
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PostPosted: Mon Jan 08, 2018 5:56 am    Post subject: Reply with quote Reply with quote including images

Technically no.
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SuperRedMR2




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1990 Toyota MR2 Mk1b

PostPosted: Fri Jan 12, 2018 9:28 am    Post subject: Reply with quote Reply with quote including images

What are the specs of the SC fuel regulator?
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Lauren
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PostPosted: Fri Jan 12, 2018 6:30 pm    Post subject: Reply with quote Reply with quote including images

Five seconds on Google. I recommend it.

http://www.mr2.com/forums/threads/102743-SC-Fuel-pump-specs
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feral4mr2




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PostPosted: Sun Mar 25, 2018 10:08 am    Post subject: Reply with quote Reply with quote including images

ran my jdm 4agze swap on the stock na fuel pump for many years, even when i converted to turbo. never had an issue or lean out up to 18psi. used the stock 4agze fpr.
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SuperRedMR2




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1990 Toyota MR2 Mk1b

PostPosted: Fri Mar 30, 2018 3:04 pm    Post subject: Reply with quote Reply with quote including images

I donít think Iíll bother.
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feral4mr2




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PostPosted: Sun Apr 01, 2018 12:26 am    Post subject: Reply with quote Reply with quote including images

it's not hard to whip the tank out and replace it anyways. [Smile]
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