Joe Posted April 18, 2006 Report Share Posted April 18, 2006 Here are some pictures of my finally running 1987 RX-7 Turbo. I am currently trying to figure out WTF is going on with my overboost issues. I think that I have them solved and will hopefully find out tomorrow. Once those are solved, the boost tuning starts and the HP numbers start rolling in! Here is the Series 4 engine with slight modifications. http://columbusdiscgolf.com/IMAGES/Joe_Pics/RX7/RX7EngineBay.jpg http://columbusdiscgolf.com/IMAGES/Joe_Pics/RX7/RX7EngineBay2.jpg FMIC - note the minor bumper modifications that were made to house it http://columbusdiscgolf.com/IMAGES/Joe_Pics/RX7/RX7Front.jpg Yup, as with any other 19 year old car, needs some body work http://columbusdiscgolf.com/IMAGES/Joe_Pics/RX7/RX7LeftSideFull.jpg Tinman fabricated custom 3.5" exhaust and Borla XR-1 Race Muffler http://columbusdiscgolf.com/IMAGES/Joe_Pics/RX7/RX7Side.jpg "Entry Level" sized single turbo http://columbusdiscgolf.com/IMAGES/Joe_Pics/RX7/T04ETurbo.jpg And finally, the suspected cause of my overboosting issue! http://columbusdiscgolf.com/IMAGES/Joe_Pics/RX7/WastegateOfDoom.jpg Quote Link to comment Share on other sites More sharing options...
wnaplay1647545503 Posted April 18, 2006 Report Share Posted April 18, 2006 Some pretty sweet pics you got there. Quote Link to comment Share on other sites More sharing options...
Guest Removed Posted April 18, 2006 Report Share Posted April 18, 2006 [IMG]http://i5.photobucket.com/albums/y196/gearhead559/killerkitty.gif[/IMG] Quote Link to comment Share on other sites More sharing options...
wnaplay1647545503 Posted April 18, 2006 Report Share Posted April 18, 2006 :offtopic: :wtf: Quote Link to comment Share on other sites More sharing options...
Joe Posted April 18, 2006 Author Report Share Posted April 18, 2006 Some pretty sweet pics you got there. thanks you should check back now that all the editing has happened. Quote Link to comment Share on other sites More sharing options...
byhi Posted April 18, 2006 Report Share Posted April 18, 2006 Thats looks like a 50mm HKS wastegate, how much boost are you trying to run? Hopefully alot. Quote Link to comment Share on other sites More sharing options...
SpaceGhost Posted April 18, 2006 Report Share Posted April 18, 2006 Thats looks like a 50mm HKS wastegate, how much boost are you trying to run? Hopefully alot. If a lot is 10-15 psi then yes! JOE WTF is up with the spacing of the pics? You suck at the intra-web-net thingy...... FIX That Shit! Quote Link to comment Share on other sites More sharing options...
Joe Posted April 18, 2006 Author Report Share Posted April 18, 2006 If a lot is 10-15 psi then yes! JOE WTF is up with the spacing of the pics? You suck at the intra-web-net thingy...... FIX That Shit! Um, yeah - I dont know whats up with the spacing. I just put the image html on a seperate line from each other. Maybe I should have them right after each other....i think i will try that. On a brighter note, I think that I fixed the boost spiking issue!! Just removed wastegate spring pretensioner bolt (AKA boltus maximus) that goes through the top of the wastegate and it acts like it wants to hold at 12psi. I need a co-pilot to help keep tabs on the AFR so that I can watch boost and drive, any volunteers! Just need you to sign this here little form...heh. Quote Link to comment Share on other sites More sharing options...
Joe Posted April 18, 2006 Author Report Share Posted April 18, 2006 Thats looks like a 50mm HKS wastegate, how much boost are you trying to run? Hopefully alot. I think I have the situation figured out. It seems that, and BDC (my tuner and RX7 Jesus) agrees with me on this, a super high flow exhaust (read 3.5" or more) tends to outflow the wastegate. I believe that Tony (Badog) agrees with this also. The theory being that because its such a low restriction the exhaust gas can generate such a high velocity that the turbo will hit very hard and spool very fast, but those gasses will simply be moving too fast to properly feed the wastegate. It makes sense in a weird sort of way. What I did to my car was to remove the wastegate spring pretensioner bolt that was installed in the top of the wastegate completely. I then richened the boost curve by 1% at 3500rpm, 2% at 4000, and 3% from 4500 and up just to be on the safe side should there be a spike. I drove the car, and in second gear boost seems to hold at 12 psi on a 9.6psi spring. My AFRs start out in the 13s go into 12s then settles in the mid 11s, eventually seeming to bottem out at around a very conservative 10.9-11.0. I did not see 15psi even in 3rd gear at high engine loads so I am thinking that I have mostly solved whatever was going on. Maybe there was still a little pretension on the spring, esentially making it act like a heavier one. I need to drive it with a co-pilot to verify this, but it seems that its pretty safe. The turbo spools fast - if at around 3000rpm I stab the pedal, I have 10-12psi around 3500 to 4000rpm. It does not fall off at all, and the car is much faster than it was when pedaling it. For comparison, I paced a 310awhp STi and he did not really pull away from me while I was pedaling the car to keep it at 10ish psi. I am interested to see how I fare now. By my and BDC's estimates I should be in the 300-330whp range now. Not too shabby of a starting point for a stock ported motor on such a large hotside. I am in love with the T04E turbo, and going with the P trim wheel and a 1.15 hotside seems to be the perfect choice for relatively fast spoolup time and not running out of breath at the top. He is coming back up here (Ohio) in July and I will be getting back on the dyno to finish my 93oct tune and then dabbling with 100 unleaded and then some C16! Cannot wait to see what 18-20 psi will feel like!!! Stupid rotaries behaving like no other engine out there! Quote Link to comment Share on other sites More sharing options...
Farkas Posted April 18, 2006 Report Share Posted April 18, 2006 http://i6.photobucket.com/albums/y233/Leetheslacker/crap/diagram.gif hahahah, funnay Quote Link to comment Share on other sites More sharing options...
Joe Posted April 19, 2006 Author Report Share Posted April 19, 2006 yeah me too! i think its a conspiricy by Mazda Quote Link to comment Share on other sites More sharing options...
Lustalbert Posted April 19, 2006 Report Share Posted April 19, 2006 Damn alien technology. Quote Link to comment Share on other sites More sharing options...
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