Bean Posted May 17, 2015 Report Share Posted May 17, 2015 If I don't do the EFR (that has it built in), I wanted to use Snapse Engineering recirculating valve and external wastegate. http://www.synapseengineering.com/v4/dv/ OEM bolts would be OK for standard boost, but I want to be able to boost to fuel limits if I want too which should be easily double stock boost levels, so the added security of stronger ARP head studs is appealing. Rabin Quote Link to comment Share on other sites More sharing options...
Stewart Posted May 18, 2015 Report Share Posted May 18, 2015 I just want a simple Bosch unit which can take 1 bar. I'm only wanting 12 psi boost. OEM bolts would be the best. A head gasket failure from too much cylinder pressure is due to pre ignition or detonation, these days. Hope this helps! Quote Link to comment Share on other sites More sharing options...
keebs Posted May 18, 2015 Author Report Share Posted May 18, 2015 Audi part# 06A145710N, BMWs and 911s use the same style valve. If you still cant source one I suggest buying aftermarket made in country. My bosch leaked too. I think the dsm valves are 2 bolt flange, but not too sure. The oem bolts should be fine, but if I can get studs I will. Most of our head gaskets seem to be marginal anyway so any insurance is good. Quote Link to comment Share on other sites More sharing options...
Stewart Posted May 20, 2015 Report Share Posted May 20, 2015 Thanks for that info and all that is shared. I'll check the number. i used some of your egt tuning on Sunday. I used it with the idle ignition timing. A bit of old mechanic Sunday thinkin' lead me to this, "If an engine is to have a strong solid idle, it needs perfect "power" mixture ( 12.5 :1) and the timing at the best point. Best ignition point with best air fuel means the least amount of heat in the exhaust pipe" So as the engine sat idling I advanced and retarded the idle ignition 4 or 5 degrees either way and watched the EGT. It got to 330 C or 329C minimum. That has got to be the best ignition point! It has also reduced the cooling fan cycling remarkably. The cam is 280 seat to seat and 240 at 0.050" clearance and it sits and holds fan, lights etc. idling at 970 rpm. That is 20 rpm over a stock cam. Pretty happy with that! Quote Link to comment Share on other sites More sharing options...
keebs Posted May 20, 2015 Author Report Share Posted May 20, 2015 Cool, I usually get to that point and back a few degrees out. What's the old vs new idle timing? Quote Link to comment Share on other sites More sharing options...
Stewart Posted May 20, 2015 Report Share Posted May 20, 2015 Turns out 16 now to 15 before, but the egt , cold start and running is a lot different. A simple and measured way to find that sweet spot! I fill 16 in on the map from 700 to 1200, 15 kpa either side of the idle manifold pressure . Static at 13 which fires up well in all temps and the path from crank to idle is constant. Good simple stuff to keep in the memory bank. Quote Link to comment Share on other sites More sharing options...
keebs Posted May 20, 2015 Author Report Share Posted May 20, 2015 Well you were damn close to atart with. You use 13 degrees while cranking? That's mighty stiff, keep it near 0 so she'll never have a chance to kick back. Quote Link to comment Share on other sites More sharing options...
Stewart Posted May 21, 2015 Report Share Posted May 21, 2015 I'll try that. What's the theory? Start at 0 btdc for crank and use the injector pulse width, the engine idles on? Quote Link to comment Share on other sites More sharing options...
keebs Posted May 21, 2015 Author Report Share Posted May 21, 2015 No theory, just taking advantage of not having a mech dizzy. Quote Link to comment Share on other sites More sharing options...
keebs Posted May 23, 2015 Author Report Share Posted May 23, 2015 Had a few talks with ARP this week and they're currently working on a price for one set of head studs. If anyone wants head studs call 805-525-1497 and show some interest or it wont happen. The spec is M12x1.25-30mm long block thread. M12x1.00-25mm long nut thread. 205mm overall length. 10 studs per block. Quote Link to comment Share on other sites More sharing options...
Bean Posted May 23, 2015 Report Share Posted May 23, 2015 Edited: Quick google found M12x1.00 nuts. Anybody in particular to speak too, or specific deal to reference? I'm in for one set as long as pricing isn't really absurd - two sets if it's verging on reasonable. Rabin Quote Link to comment Share on other sites More sharing options...
keebs Posted May 23, 2015 Author Report Share Posted May 23, 2015 Talked to two different guys didn't catch their names. Don't have a specific deal, but if they get enough calls they will have to do a production run. Tell all, anyone popular in the matra forums? Even people without the n9t should call and act interested, one production run would cover us for 20 years. Quote Link to comment Share on other sites More sharing options...
V-M Posted May 25, 2015 Report Share Posted May 25, 2015 Price? 2 sets if price is around 100$ V-M Quote Link to comment Share on other sites More sharing options...
keebs Posted May 30, 2015 Author Report Share Posted May 30, 2015 Got a call from ARP today, 8740 studs 57usd per stud without nuts. Quote Link to comment Share on other sites More sharing options...
V-M Posted May 30, 2015 Report Share Posted May 30, 2015 per stud? Bit pricy... Why no nuts and spacers? Not even offered? V-M Quote Link to comment Share on other sites More sharing options...
keebs Posted May 30, 2015 Author Report Share Posted May 30, 2015 Didn't ask for them. Quote Link to comment Share on other sites More sharing options...
Bean Posted May 30, 2015 Report Share Posted May 30, 2015 $600 for studs for one motor is well beyond my means. I'd much rather spend $500 on the timesert kit and do all my motors to fit existing studs. Another option would be to just drill out and tap to a slightly bigger SAE size that had readily available size in ARP studs. With the right fixture it should be easy enough to do. Rabin Quote Link to comment Share on other sites More sharing options...
Bean Posted May 30, 2015 Report Share Posted May 30, 2015 Any chance there was any discussion on at what point there would be price drops due to volume? With effort we should be able to get 5 - 10 sets, but that still might not offset costs very much. Rabin Quote Link to comment Share on other sites More sharing options...
V-M Posted May 31, 2015 Report Share Posted May 31, 2015 well there is sets sold as ^150$ so it sounds like shooting in dark. Bit more info before proceed V-M Quote Link to comment Share on other sites More sharing options...
Bean Posted May 31, 2015 Report Share Posted May 31, 2015 Do you have more info on $150 sets? Or are they OEM bolts? Rabin Quote Link to comment Share on other sites More sharing options...
keebs Posted May 31, 2015 Author Report Share Posted May 31, 2015 Didn't talk about price breaks, I was at work only got the voice-mail. I take it nobody called and showed interest? 5 sets would probably get us closer to 300usd. Quote Link to comment Share on other sites More sharing options...
Bean Posted May 31, 2015 Report Share Posted May 31, 2015 I called and voiced interest - but the person didn't seem to care either way - I'll try again if there's someone specific to talk to. On another note I should have pricing on MLS head gaskets, silicone valve cover and oil pan gaskets, and metal exhaust manifold gaskets. Rabin Quote Link to comment Share on other sites More sharing options...
keebs Posted May 31, 2015 Author Report Share Posted May 31, 2015 They weren't too helpful the first time I called either. I'll take another listen to the message to see if there's a name attatched to the voice. Cool, did you send a pattern or is it just a generic estimate? Quote Link to comment Share on other sites More sharing options...
V-M Posted June 2, 2015 Report Share Posted June 2, 2015 My comment from 150$ was on based just arp net search like this one -> http://www.summitracing.com/int/search/brand/arp/product-line/arp-pro-series-cylinder-head-stud-kits?SortBy=Default&SortOrder=Ascending&N=400295%2B315797%2B4294948658 Some one has taken original bolt measurements? Maybe some other brand car manuf bolt set will do the job. Answering to my self. M12 (19mm head), bolt length 190mm, threath lenght 27mm and lift 1,25 V-M Quote Link to comment Share on other sites More sharing options...
keebs Posted June 9, 2015 Author Report Share Posted June 9, 2015 Sorry for the long wait, it's been a busy week. The guy that called from ARP is named Alex for those interested. Quote Link to comment Share on other sites More sharing options...
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