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Dimsun Racing

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Everything posted by Dimsun Racing

  1. You need some gusseting on the other side of the X junction in the center. If you look at the cross section right at the center you only have one tube, compare to Mender's which does not splice one of the tubes at the center, his are both continuous through the center. Although the spliced style is common I don't think it's very strong in a side impact, as the center is the weakest point in a side impact.
  2. Seat belts are considered static as compared to dynamic as far as stretch, they stretch very little. I don't think mounting distance matters that much, look how much extra length they provide, so it must be within parameters. The more important factor is mounting angle from the horizontal. Also I don't think you are getting much more additional stretch from a multi-impact crash. Compare our level of racing to Nascar, with similar belts, it must be safe.
  3. factory alternators are usually the best, especially Japanese. Honda alt lasts 150K, aftermarket lucky to get 30K. They do cost more
  4. I forgot the ZX weighs more. So the 200hp J30 swap 280z is 2250 lbs and it ran at the front no problem in 2016-17. The West coast series has speed creep and that's no longer competitive. Haven't raced Champcar since they left the West coast, so don't know how it's progressed. 2250/200 = 11.25 lbs/ 1 HP 2250/200 = 2500/X X = 222 So you need 222HP to be competitive by 2017 standards. If you start with the base VG hp at 190 that puts you at 206 VPI Interesting than the Z and ZX get the same VPI considering the ZX is 250 lbs heavier. It does have better aero and a s
  5. VQ30DE would work in a 280Z, at 190 HP that puts it at 190 VPI. Real world they are generally more $$ than a J30 but since it bolts up to RWD 5speeds probably the same $$ in total and less labor. Should still come under the $1500 total max. And you could run for the new Nissan awards program because it requires Nissan car and Nissan engine/drive train.
  6. RPM Systems in New York state is the go to guy for running stock ECU's in Honda J swaps. He will mod your J series ECU to eliminate the immobilizer and AT circuits for under $100. http://www.go-rpm.com/ Another place for electronics is Arizona Performance Imports but they are bank. They do J swaps in ORV's http://www.arizonaperformanceimports.com/ J30 is 350 lbs 200hp with manifolds and AT flex plate, no AC or Alt. FWIW I ran a smart phone HP app on the Jswap 280Z and it was right at 200hp at the wheels The best place for J series specs is Wikipedia. HP is
  7. When you use the term "lift" does it always mean lifting the vehicle or does it sometimes mean airplane wing lift, which in the case of an upside down wing would mean downforce? I've seen the term "lift" used in context with you and other manufactures and it would sometimes seem to mean downforce. If you compare wings of different widths (with the same cord), do the downforce/drag ratios stay pretty much the same? Comparing say a 55" to a 70" width. I'm trying to calc what a 55" wing would do compared to 70", would it be accurate if you reduced the downforce number the
  8. "75 280Z J30 Honda swap, 2250 lbs. front 11"x 7/8" Sentra SE-R rotor, RX7 4 piston alum caliper, Hawk Blue pads rear 11" x 5/8" Sentra SE-R rotor (cut down), Z32 2 piston alum caliper, generic ceramic pads 3" brake ducting the brake ducting is important, with optimized ducting you can reduce rotor size and thus rotating and unsprung weight. A key item is the duct at the rotor, it should seal on the rotor and direct air to the central vanes, either at the inside or outside edge. Just pointing the duct at the inside face of the rotor is going to mean uneven cooling. You
  9. The flywheel spacer is 2nd in difficulty to locating the dowel locator pins on the main adapter plate It's about $20 worth of aluminum and 2-3 hours on a small manual lathe and a drill press with a rotary table. All racers need to be friends with a local hobby machinist, or a rental machine shop or rental fabrication shop. The difference with the InlinePro spacer is their's costs $300, the dimensions are virtually the same. The only thing that might be different is the height (thickness), that depends on where the flywheel surface needs to be positioned in relation to the input splin
  10. Agree with you on a total length restriction. But the reason they give you 5 minutes for a pit stop is so you don't rush. With the smaller size fueling diameters you end up rushing because it takes longer to fuel and leaves you less time to get the driver in the car and situated. This has become more of a problem with faster cars that need more fuel.
  11. Yes adapter bolts to engine and trans from each side. The flywheel spacer (pic attached) is so it sits the right distance from the trans so the input splines engage the clutch disc and the T/O bearing is at the right distance to push the pressure plate. The OD of the rear crank flanges (4 and 6 cyl) are also the same, that's where the flywheel centers. the adapter plate has a large centered hole that completely clears the flywheel, larger than the InlinePro plate. 4 banger flywheel has the same 8 bolt pattern as the V6 just the center hole needs to be enlarg
  12. One thing I don't think has been mentioned. You should size your cell a couple of gallons larger than you want the actual capacity to be. I've noticed say a 22 gallon cell. You add an in cell pump, lines, a catch can, and some safety foam and you lose some capacity. Some of the types of foam are more dense and take up more room. A 22 gallon cell can actually only hold 20.5 gallons. I think the cell sides also bow in a little bit reducing capacity. The EVO I was crewing for a couple weeks back had a 24 gal cell and it only held 22.5 gal.
  13. An S2000 Jswap. He ran the coolant pipes down the plenum to the front. He put the starter underneath from the engine side https://honda-tech.com/forums/hybrid-engine-swaps-18/turbo-j32a2-s2000-build-thread-3017287/ My swap build page on hybridz https://forums.hybridz.org/topic/123705-honda-v6-swap/#comments
  14. Yeah, and the internals swap between brands as long as they are close to the same years.
  15. The T5 is much more common in the pick-n-pulls. PnP has a flat rate on all parts, engines are $150 and trans are $115. Most them have at least one 5 speed Mustang, the one near my house had three. You virtually never see a Z32 at a pick-n-pull. The T5 is the most common 5 speed in the world, there's a ton of aftermarket parts, you can get numerous different gear ratios. And the Z32 that I found for cheap after 3 months searching came with an AT.
  16. There's a 1/2" aluminum adapter plate, bolted to the engine with four countersunk flathead allen bolts. Four other bolts come from the engine side and thread into the plate. The Trans bolts are the same way, some from the trans side and some from the engine side. All the threaded holes in the plate have steel timeserts. The hard part is getting the locator dowels precise so everything is centered. You can just transfer punch the engine locator dowels in the plate after the plate is bolted to the engine, the alignment doesn't happen there. When you drill the trans locator dowels in the plate yo
  17. This was the Thursday race with Chumpcar Nov 2016 at Laguna Seca. The video is from the CYR BMW with the IMSA pro driver Misha Goikhberg and Thomas Micich in the white J30 Z. The action starts around 6:20. We DNF'd this race in one of the later stints when the clutch started slipping. We won the next day with Misha driving one of the stints.
  18. I sold the J30A1 swap to a guy with an S13, he's using a S14 5 speed The Z32 (2nd gen 300zx) I'm building now will have a J32A2 with a BorgWarner T5 (Tremec). This build is for the West coast series, there's a few LS swaps already and a couple of EVO's so it will be doing good if it runs in the front. The J32 is from an Acura CL type S, from 2000 to 2003, before they went to electric throttle. There's a guy in NY state that mods the stock ECU, he disables the immobilizer and A/T circuits. For $100 you don't have to run a programmable ECU. The numbers in the Honda engi
  19. I don't know why more people don't look at the J30 swap. (200hp) 350 lbs. This car won 4 races in a row in 2017. It had 456 points. Car was 2250 lbs. The weak link was the stock Z trans, and it's getting harder to find one that's not already worn out. I'm working on an adapter to go to a T5 Borg Warner. And the next build will be a Z32 J32 because the West Coast series has some speed creep and the J30 is no longer competitive. Didn't save any weight going from the stock L28 to the J30 even though it went from iron block to alum block, but it got the weight back to where the
  20. Some of the Honda years used whale oil in the manufacturing process for their wiring since they have to import petroleum. Some people think this causes the rodents to be attracted to chew on the wiring.
  21. This is a good idea. The Japanese metallurgy has improved over time. They've increased the amp capacity of the copper so they can run smaller gauge wiring. Plus you get every different color imaginable.
  22. I do a lot of crewing in one of the other series, the biggest problem I see with racecars is not having the largest Hunsaker spout available. Sure you have 5 minutes but if you use up all that time fueling it leaves less time for other necessary things during the pitstop. Like say if you have to sort a radio issue. It's getting so competitive you can't make mistakes anymore and stay in the running. The biggest Hunsaker spout is a 2.25" ID hose (not OD). This will dump 5+ gal of fuel in 5 seconds, everything else is in the dust. This means you need a 3" OD filler neck and the pref
  23. These are a pita to fill, especially if you have a wing. We got penalized 5 min last race because of spillage because it was hard to lean over the car and get the spout in and out. You're holding the 5 gal jug with the spout strait up with one hand and with the other hand you have to bend the 2.25" hose till the spout is straight down. Not easy and leads to spills.
  24. Gauges most affordable https://www.ebay.com/sch/renbusan/m.html?_nkw=&_armrs=1&_ipg=&_from= name brand, still sort of affordable https://www.speedhut.com/gauges/ wiring, connectors, switches, wiring accessories, affordable https://www.waytekwire.com/wps/portal/en/products
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