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Old 03-13-2001, 01:15 PM   #1
svxtrem
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Do you have the parts to look at? I believe the '98 injectors are side feeds. The fuel rail 'wraps around' the injector. I know the '99s are top feed. To use the '98, see if the fuel rail will fit the '99 intake manifold. If not, you have to use the '99 fuel rail and injectors. As I told you in your other post, I'm not sure that they have the same flow rates and impedance. If you have access to both, just see if you can bolt the '98 rail and injectors into the '99 intake. Otherwise, take a '98 injector and a '99 injector and send them to RC engineering. They can tell you flow and impedance.

svxtrem
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Old 03-13-2001, 02:03 PM   #2
Sean McElderry
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Old 03-13-2001, 02:12 PM   #3
8Complex

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Hmmmm... you may have a few problems with the internal maps of the ECU in regards to fueling and timing. The 98 had lower compression, and a different volumetric effeciency due to the DOHC heads.
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Old 03-13-2001, 05:58 PM   #4
Rovah
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I've sent an e-mail to Shiv. I'll report back when I hear from him.

Thanks for all the help and links! :-)

John
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Old 03-14-2001, 12:12 AM   #5
Rovah
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Post EFI differences '98 vs '99

I'm putting a '99 SOHC engine in my '98 RS and am trying to figure out if I can use my '98 ECU and MAF.

The biggest question is whether the '99 fuel rail and injectors are the same as the '98?

Any help is greatly appreciated! John
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Old 03-16-2001, 12:06 AM   #6
shiv
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Hi Rovah--

I think you're in for some serious work The MY98 injectors are different than the MY99 injectors. Same with the fuel rail. MY98 use a side feed set up while the MY99 and up use traditional top feed. There are differences with the MAF and ECU. Trying to mix and match these components may be very troublesome. While I'm sure it can be done in time, I suspect you will run into few a few unexpected glitches.

Hope that helps somewhat...

Cheers,
shiv
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Old 03-16-2001, 02:59 AM   #7
H5N1
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Rovah,

So why are you trying to put a '99 SOHC engine into the MY98? I'm thinking the same thing as to replace my DOHC with a SOHC, but is it worth the hassle?
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Old 03-16-2001, 11:34 AM   #8
svxtrem
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You do NOT have to worry about 'fuel maps' with a MAF sensor. You could put in a 2.0 liter, 4 liter, whatever and the fueling will still work. (Unless you run out of injector or MAF capacity). An ECU with a MAF does not use a 'VE' compensator. That is used for speed-density systems. So, the fuel maps are fine. Now, as far as timing, that is something a little different. Timing maps ARE affected by VE. They will be different for different engines. However, I think I can say that in the case of the SOHC vs DOHC, the differences will be negligible. As I said before, don't mix and match the parts. Just use the entire '98 or entire '99 setup.
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