Project Speedboat -- 95 Roadmaster M6 sleeper

[Catmaigne]

Some recent pics0818181530_HDR_Film1-1.jpeg0818181519_HDR_Film1.jpeg0818181520_Film1.jpeg

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[SSlowBoat]

Swapped the MAF to the f-body unit and made an airbox to hold a big Spectre cone filter. Took the car out for some pics and datalogging but it started raining

The f-car MAF reads consistently higher and the car runs over a point richer up top according to my wideband. Seeing less of a MAP drop with the cone filter and more g/sec, but still not where I want to be before the car gets thrown on the dyno. It was around 300 g/sec but it could be reading lower because of the heat and humidity. My Camaro made about 1.15 hp per g/sec so I'd need 320-330 g/sec out of this thing for 370-380whp ignoring other factors. Gonna ditch the stock tb and home port a spare intake mani to see if that nets me anything.

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I had a much larger cam and le2 heads to get 387whp. Weston with same cam but stockish heads made 359whp or something, both of us thru a 6spd. I don't know if your cam has enough

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[Catmaigne]

I had a much larger cam and le2 heads to get 387whp. Weston with same cam but stockish heads made 359whp or something, both of us thru a 6spd. I don't know if your cam has enough

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It's all in the details. Timing and fueling in line? MAP drop minimized? How many afgs relative to other setups? On the Camaro, I went from 382 to 425whp with some pretty minor mods and tuning revisions.

There was a guy who made 400whp with a LE1/cc306 setup. Hopefully 370 is attainable if my setup is well optimised.

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[SSlowBoat]

It's all in the details. Timing and fueling in line? MAP drop minimized? How many afgs relative to other setups? On the Camaro, I went from 382 to 425whp with some pretty minor mods and tuning revisions.

There was a guy who made 400whp with a LE1/cc306 setup. Hopefully 370 is attainable if my setup is well optimised.

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true, I know you're OCD, but you're Camaro is a stroker lol. I hope you get it, that would be pretty impressive to see.

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[Catmaigne]

true, I know you're OCD, but you're Camaro is a stroker lol. I hope you get it, that would be pretty impressive to see.

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I know, I'm just saying that there's a lot of little factors people want to ignore because some grouch on ls1tech said those mods were a waste of time. Statements like, "I made 500whp with a stock throttle body, the stock one is fine." I stopped listening to that garbage, got a Holley 58mm, lightly ported my LT4 mani, ripped my Moroso CAI out, added 4 deg timing, leaned it out a point and bam.... +43hp. There are a lot of little details that can be overlooked and it sounds like your LE2 motor had the potential to crack 400 if there are people doing it with LE1's and a shelf cam. Wasn't that cam a LE grind in the low 230's?

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[SSlowBoat]

I know, I'm just saying that there's a lot of little factors people want to ignore because some grouch on ls1tech said those mods were a waste of time. Statements like, "I made 500whp with a stock throttle body, the stock one is fine." I stopped listening to that garbage, got a Holley 58mm, lightly ported my LT4 mani, ripped my Moroso CAI out, added 4 deg timing, leaned it out a point and bam.... +43hp. There are a lot of little details that can be overlooked and it sounds like your LE2 motor had the potential to crack 400 if there are people doing it with LE1's and a shelf cam. Wasn't that cam a LE grind in the low 230's?

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my motor probably can make more, I have not spent any time optimizing anything. I'm lucky it runs. low 230's duration, high .5xxs lift. dyno day was shit injectors a mashed up tune and a failing opti. one day I'll actually spend the time, but once again it's just make car run so it's not a lawn ornament

I also take anyone's internet dyno talk with a grain of salt because we all know how easy it is to skew a dyno. hence why osies car has a 9" now, dyno doesn't tell us anything besides afr looks good, seeing what it does on track will be more telling.

this reminds me, I need to get more PVC for the impala's intake


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[Catmaigne]

I would just grab a 3.5" pipe and 3.5/3.25" coupler on ebay, the pvc is too small on the inside.

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[SSlowBoat]

no its not, I've already tested that theory lol

I would just grab a 3.5" pipe and 3.5/3.25" coupler on ebay, the pvc is too small on the inside.

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[Catmaigne]

I got a 4-bolt vette block in a parts deal a few years back along with some other engine goodies. It has been bored 0.030 and honed for a forged set of Probe SRS pistons, line bored with ARP studs, freeze plugs, cam bearings, etc. I went and double checked the piston/wall clearances and found I can get everything between 41-46 ten thou which is good. The pistons have a dish that's not big enough for FI or small enough for a decent NA/spray build in a 355 with my LE1's unfortunately. If I increase the stroke a little, it'll make the compression more reasonable. With 3.8", I'll have a 388ci motor with 12.1:1 on my heads. The block hasn't been decked (just cleaned up) so I will have enough material for the extra stroke over a 383.

The block came with hellfire rings and I have a XFI468 sitting on the shelf I'd like to make use of. Might make a decent spray motor. The LE1's aren't ideal in this case but I'm trying to throw this together on a tight budget and reuse the Roadmaster's top end (except valve springs, pushrods, maybe lifters, etc.).

I've been wanting to make use of this stuff for a while but honestly didn't want to put it into this car (because it's too ugly). I think ultimately the entire drivetrain will end up in an older B-body (like a 2 door 77+ Impala/Caprice) or C-body (77+ Coupe Deville) because I'm lazy and want to reuse the suspension, rear end, 6 spd parts, and other bits. The current car is gonna be the test pig though.

So the shopping list looks like:
-Scat 3.8" 4340 crank
-Scat 6" 4340 7/16" arp2000 rods
-Melling 10552
-BTR spring kit?

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[shownomercy]

Would advise thoroughly researching hellfire rings prior to installing and using them.