The MegaSquirt Project has experienced explosive growth other the years, with hundreds of new MS installations occurring every week - a phenomenal success! MegaSquirt has been successfully used in all aspects of Internal Combustion engine applications including R&D, Industry, Race, and Research. The MS project has transformed itself from a simple R&D project into a full-featured mature engine control system. To reflect this the support structure has also changed to meet the needs of MegaSquirt Users.
Moving forward, the R&D forums for MegaSquirt project are in a read-only mode - no new forum posts are accepted.
However the forums will remain available for view, they still contain a wealth of information on how MegaSquirt works, how it is installed and used. Feel free to search the forums for information, facts, and overview.While the R&D forum traffic has slowed in recent years, this is not at all a reflection of Megasquirt users, which continue to grow year after year. What has changed is that the method of MegaSquirt support today has rapidly moved to Facebook, this is where the vast majority of interaction is happening now. For those not on Facebook the msextra forums is another place for product support. Finally, for product selection assistance, all of the MegaSquirt vendors are there to help you select a system, along with all of the required pieces to make it complete.
Forum rules
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.
Finished up the fuel system and started the 455 today to break in the cam. The engine is fully rebuilt, with a mild 220/230 cam,performer intake,1000cfm throttle body, headers/dual 2.5 magnaflow exhaust, and megasquirt. The car starts, idles, and revs beautifully. Once the air ride is completed I'll finish tuning it on the road...
MSBoostedEscort wrote:that thing should spin at least 8k
Haha, only if you want to collect the rods & pieces of what used to be the crank in the pan.
From memory the olds 455 are pretty much the same as the Pontiac 455's. They are game over by about 5500rpm due to the stroke and rotating assembly weight, but god damn they'll pull put some tree stumps getting there!
Sydney, Australia
Successfully MS2 v3.0 squirted 1971 Holden Monaro HQ
400 Pontiac, ported #16 heads, Tomahawk intake with custom plenum using LS1 78mm throttle body dialed in with a TechEdge 2E0 Wideband Controller.
getting "slightly" off topic....but a friend of mine has a 455 in his 72 grand prix that has been bored and stroked to a 468 (if I remember right) with a 250 shot on top of it. He spins it to 6500 RPM's....very daring IMO. But it is seriuosly built engine too.
But man does that thing sound wicked. 4000 pound car running low tens....when its running anyway
we have a project 68 buick riviera with a 455 and ti has no problems turning 8k whild doing a nice harsh torturous burnout. our goal was to explode it so we coudl go thru the motor, its completly stock and has never been touched. given we had to put a 850 holley on it to spin that high, but it does it until the points come apart
455 has a 4.21 stroke (stock) which comes out to 5600 fpm average piston speed at 8000RPMs. Now I won't say its not feasible for a motor to survive that....for a little while, its really really close to InstantBoom land.
Don't forget your inlet ports would have to be the size of tennis balls or have a hoover vacuum cleaner somewhere in the combustion chamber to even warrant those sort of revs
Oh, and a cam that's open 361° @ 0.050
RIGHTO, enough smarty comments from me... Back to the topic, good job on the 455 !!
Sydney, Australia
Successfully MS2 v3.0 squirted 1971 Holden Monaro HQ
400 Pontiac, ported #16 heads, Tomahawk intake with custom plenum using LS1 78mm throttle body dialed in with a TechEdge 2E0 Wideband Controller.
