fuuuuuuuu I need to finish my intake so I can up the boost!!!
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M42 turbo fact thread
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More Info:
Better pics and such when I have time, busy preparing it for the Mattara Hillclimb this October long weekend. I am running in the club day event on the Monday because all my mates are but anyway.
So Basic Specs:
BMW M42 (1.8L 4 Cylinder)
CP Pistons
ARP Rod Bolts, Main Studs, Oversize Headstuds
O-ringed Head and Block, Copper Headgasket
Cat Cams, VAC Motorsport Springs and Retainers
Custom Rear Sump
Garret GT3076R, 0.63 Rear Housing, Tial MVR 44 on custom Manifold
DTA S60 still running the show
Fuel Cell, 2 x 044's, 1600 Bosch Injectors and a bunch of other supporting mods.
I have changed to a Getrag G260 (325i trans) overdrive transmission and a 3.46 rear end, this is good for a touch over 200 in 4th and should mean I don't have to change to 5th at Wakefield.
There has been a whole pile of background developments but they are for later. Right now I am going to drive the wheels off this thing and put the development program on hold, I am well sick of wrenching.
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Howdy so I figured this thread gets more traffic than my silly project thread. I just got through pulling my motor and what not so now is the time to decide what I want to do with it. My goals are 250-300whp, but I would like to know I could maybe go a little more in the future so I wanna just build my motor up now while it's already out. Here is what I was thinking:
-85mm overbore
-Arrow precision forged H-Beam connecting rods
-CP 8:5:1 forged pistons
-MLS head gasket (.70)
-ARP Head stud kit
-One piece forged stainless steel valves (7mm)
-Steel alloy retainers
-Dual interference springs
-Spring seats
-Polished and balanced OEM crank
-Ported and polished head
My biggest concerns are should I use the same camshafts? Or is it totally worth it to get the VAC camshafts for turbocharged motors.. Also what should I be looking at for main bearings and rod bearings. Does anyone know if there are acl racing bearings for the m42 or a good set I could get.
Here are the links to everything I was looking at from VAC:
The M42 turbo kit which includes
-Pistons
-H-Beam connecting rods
-MLS gasket
-ARP head stud kit
The valve kit I'm looking at.
The valve spring and retainer kit which has
-springs
-valve retainers
-spring seats
Duration (Degrees): 269 / 269 "Sport" Grind; 280 / 274 "Hot" Grind; 260 / 242 "Turbo" Grind; Custom Grind (please call or Email).
-M42 performance turbo camshaft set
Thanks for your help in advance!!
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You pretty much just described my engine. Cams would be worth it. I see a noticeable drop off after 6k and its almost not worth revving passed 6.5k. Talk to them about how much boost you plan to run. When I talked to them last they were getting a quote for me for some custom cams, they never got back to me btw, but depending on boost level and how high you want to rev they can set you up with more desirable cam specs than what is listed.
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Originally posted by MF DOOM View PostYou pretty much just described my engine. Cams would be worth it. I see a noticeable drop off after 6k and its almost not worth revving passed 6.5k. Talk to them about how much boost you plan to run. When I talked to them last they were getting a quote for me for some custom cams, they never got back to me btw, but depending on boost level and how high you want to rev they can set you up with more desirable cam specs than what is listed.
Custom cams, custom cams, custom cams...
Back-pressure, RPM range, boost level, target horsepower, A/R of turbo, turbo frame (T3, T4, T6/Thumper), head flow, cubic inches, and even location of turbo...etc. All of these factors are extremely important in determining the cam that best suits your needs. There is no rule of thumb with a turbo cam. There are too many variables and the only way to get the right cam is to take all of those your parameters into consideration, and only then can a proper cam be selected.
In truth, Godbold says 99 percent of Comp Cams' turbo grinds should be custom profiles because "pressure differential can be all over the place. The reason we don't have a lot of catalog turbo cams is because there are not a lot of catalog turbo systems." Every turbo installation is unique.
And for shits and giggles, put your calculus skills to work?
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Hi guys I'm new to this turbo thing. I'm getting to the point where I want my car to be. My engine is healthy. Full timing overhaul im thinking of getting it turbocharged. What's a realistic number of cost. My goal is atleast 160-190hp. Sorry about my noob questions lol also trying to keep cost low using stock internals.
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Originally posted by pantelones View Post^^^ There is soooo much more that goes into a turbo cam than that!
Custom cams, custom cams, custom cams...
And for shits and giggles, put your calculus skills to work?
http://www.tildentechnologies.com/Cams/index.html
The VAC turbo grinds are a great all around grind that will work with most setups. Like all turbo cams you need a free flowing exhaust to really make them shine (no log mani, no rediculiously small turbine housing). The grinds aren't 100% perfect for all applications but its still leauges ahead of using stock garbage :)-Nick
M42 on VEMS
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