can I get these to idle right?
Forum rules
Read the manual to see if your question is answered there before posting. If you have questions about MS1/Extra or MS2/Extra or other non-B&G code configuration or tuning, please post them at http://www.msextra.com The full forum rules are here: Forum Rules, be sure to read them all regularly.
Read the manual to see if your question is answered there before posting. If you have questions about MS1/Extra or MS2/Extra or other non-B&G code configuration or tuning, please post them at http://www.msextra.com The full forum rules are here: Forum Rules, be sure to read them all regularly.
can I get these to idle right?
I've got a chance to pick up a 454 TBI unit with 85# injectors, I'm wanting to use this with a basicly stock 4.3L V6. (no cat, no EGR, MS-II unit) I was wondering if I could get these injectors to idle decently, perhaps even going as far as using a vacuum regulator, which will apparently drop FP by about 5# at idle comapred to WOT or make them about 67#s by the MS calculator. The reason for this is the eventual addition of a turbocharger.
Working towards blowing up engines since 2002
-
Bernard Fife
- Super Squirter
- Posts: 1009
- Joined: Mon Feb 16, 2004 3:15 pm
Drac0nic,
When I had a Holley TBI, it had 4 85 lb/hr injectors on a 6.7 liter engine. The idle was around 1.7 milliseconds and 35 kPa. However, 1.7 milliseconds at idle is borderline.
Your engne is 64% as large, but only has half as many injectors, so that's good. On the other hand, if it is stock it might idle with a lower vacuum kPa. I'd say that it will work, but not perfectly with MS-I.
MS-II has 100x the pulse width resolution, so it would be a better match, and should be fine. For example, I have 8 72 lb/hr injectors on my engine now with MS-II, and idle isn't a problem at all.
Lance.
When I had a Holley TBI, it had 4 85 lb/hr injectors on a 6.7 liter engine. The idle was around 1.7 milliseconds and 35 kPa. However, 1.7 milliseconds at idle is borderline.
Your engne is 64% as large, but only has half as many injectors, so that's good. On the other hand, if it is stock it might idle with a lower vacuum kPa. I'd say that it will work, but not perfectly with MS-I.
MS-II has 100x the pulse width resolution, so it would be a better match, and should be fine. For example, I have 8 72 lb/hr injectors on my engine now with MS-II, and idle isn't a problem at all.
Lance.
Yes, I was sort of wondering about that. I mean, a stock Syclone comes with 30# injectors I believe, as do Buick GNs. 6X30# injectors is about 180#, which is more then the 170# from the TBI injectors. I'm just not sure that with the way the TBI system works if I'd bog the engine down horridly or not.
Working towards blowing up engines since 2002